[Bug]: NullPointerException in PythonLocaleData.getLocaleData

Reproduce the crash with the supplied re.search('A', '', 9999) snippet, then inspect PythonLocaleData.java at line 81 and the regex entry points named in the stack trace. Add regression coverage for this input and verify that it completes without a NullPointerException.

Describe the bug

GraalPy crashes when running this fuzzed code:

import re
re.search('A', '', 9999)

Operating system

Linux

CPU architecture

x86_64

GraalPy version

GraalPy 3.13.14 (Oracle GraalVM Native 25.3.4.1)

JDK version

No response

Context configuration

No response

Steps to reproduce

Snippet listed above

Expected behavior

No crash

Stack trace

java.lang.NullPointerException: Stack trace is imprecise, the top frames are missing and/or have wrong line numbers. To get precise stack traces, build the image with option -H:-ReduceImplicitExceptionStackTraceInformation
	at com.oracle.truffle.regex/com.oracle.truffle.regex.flavor.python.PythonLocaleData.getLocaleData(PythonLocaleData.java:81)
	at com.oracle.truffle.regex/com.oracle.truffle.regex.flavor.python.PythonRegexLexer.getLocaleData(PythonRegexLexer.java:198)
	at com.oracle.truffle.regex/com.oracle.truffle.regex.flavor.python.PythonRegexLexer.caseFoldUnfold(PythonRegexLexer.java:348)
	at com.oracle.truffle.regex/com.oracle.truffle.regex.flavor.python.PythonRegexParser.literalChar(PythonRegexParser.java:315)
	at com.oracle.truffle.regex/com.oracle.truffle.regex.flavor.python.PythonRegexParser.parse(PythonRegexParser.java:244)
	at com.oracle.truffle.regex/com.oracle.truffle.regex.tregex.TRegexCompilationRequest.parse(TRegexCompilationRequest.java:349)
	at com.oracle.truffle.regex/com.oracle.truffle.regex.tregex.TRegexCompilationRequest.compileInternal(TRegexCompilationRequest.java:159)
	at com.oracle.truffle.regex/com.oracle.truffle.regex.tregex.TRegexCompilationRequest.compile(TRegexCompilationRequest.java:143)
	at com.oracle.truffle.regex/com.oracle.truffle.regex.tregex.TRegexCompiler.doCompile(TRegexCompiler.java:89)
	at com.oracle.truffle.regex/com.oracle.truffle.regex.tregex.TRegexCompiler.compile(TRegexCompiler.java:75)
	at com.oracle.truffle.regex/com.oracle.truffle.regex.RegexLanguage.createRegexObject(RegexLanguage.java:205)
	at com.oracle.truffle.regex/com.oracle.truffle.regex.RegexLanguage.parse(RegexLanguage.java:164)
	at org.graalvm.truffle/com.oracle.truffle.api.TruffleLanguage$ParsingRequest.parse(TruffleLanguage.java:1204)
	at org.graalvm.truffle/com.oracle.truffle.api.TruffleLanguage.parse(TruffleLanguage.java:1618)
	at org.graalvm.truffle/com.oracle.truffle.api.LanguageAccessor$LanguageImpl.parse(LanguageAccessor.java:309)
	at org.graalvm.truffle/com.oracle.truffle.polyglot.PolyglotSourceCache.parseImpl(PolyglotSourceCache.java:114)
	at org.graalvm.truffle/com.oracle.truffle.polyglot.PolyglotSourceCache$WeakCache.lookup(PolyglotSourceCache.java:351)
	at org.graalvm.truffle/com.oracle.truffle.polyglot.PolyglotSourceCache.parseCached(PolyglotSourceCache.java:94)
	at org.graalvm.truffle/com.oracle.truffle.polyglot.PolyglotLanguageContext.parseCached(PolyglotLanguageContext.java:377)
	at org.graalvm.truffle/com.oracle.truffle.polyglot.EngineAccessor$EngineImpl.parseForLanguage(EngineAccessor.java:332)
	at org.graalvm.truffle/com.oracle.truffle.api.TruffleLanguage$Env.parseInternal(TruffleLanguage.java:2648)
	at org.graalvm.py/com.oracle.graal.python.builtins.modules.re.TRegexCache.compile(TRegexCache.java:307)
	at org.graalvm.py/com.oracle.graal.python.builtins.modules.re.PatternNodes$TRegexCompileNode.getCompiledRegexLocaleNonSensitive(PatternNodes.java:220)
	at org.graalvm.py/com.oracle.graal.python.builtins.modules.re.PatternNodes$TRegexCompileNode.localeNonSensitive(PatternNodes.java:228)
	at org.graalvm.py/com.oracle.graal.python.builtins.modules.re.PatternNodesFactory$TRegexCompileNodeGen.executeAndSpecialize(PatternNodesFactory.java:841)
	at org.graalvm.py/com.oracle.graal.python.builtins.modules.re.PatternNodesFactory$TRegexCompileNodeGen.execute(PatternNodesFactory.java:752)
	at org.graalvm.py/com.oracle.graal.python.builtins.modules.re.PatternBuiltins$NewNode.newPattern(PatternBuiltins.java:188)
	at org.graalvm.py/com.oracle.graal.python.builtins.modules.re.PatternBuiltinsFactory$NewNodeFactory$NewNodeGen.execute(PatternBuiltinsFactory.java:248)
	at org.graalvm.py/com.oracle.graal.python.nodes.function.builtins.BuiltinCallNode$BuiltinAnyCallNode.execute(BuiltinCallNode.java:64)
	at org.graalvm.py/com.oracle.graal.python.nodes.function.BuiltinFunctionRootNode.execute(BuiltinFunctionRootNode.java:337)
[...snip...]

Additional context

No response