NPE in org.eclipse.jdt.internal.compiler.lookup.BlockScope.correlateTrackingVarsIfElse()

Has anyone seen an NPE like this one? It occurred on version 3.26 when compiling a translate JSP. I'll try to provide more details soon.

This NPE is sporadic: only occurs in rare occasions.
```
exception occurred: java.lang.NullPointerException
at org.eclipse.jdt.internal.compiler.lookup.BlockScope.correlateTrackingVarsIfElse(BlockScope.java:1257)
at org.eclipse.jdt.internal.compiler.lookup.BlockScope.correlateTrackingVarsIfElse(BlockScope.java:1293)
at org.eclipse.jdt.internal.compiler.lookup.BlockScope.correlateTrackingVarsIfElse(BlockScope.java:1293)
at org.eclipse.jdt.internal.compiler.ast.IfStatement.analyseCode(IfStatement.java:146)
at org.eclipse.jdt.internal.compiler.ast.IfStatement.analyseCode(IfStatement.java:141)
at org.eclipse.jdt.internal.compiler.ast.Block.analyseCode(Block.java:50)
at org.eclipse.jdt.internal.compiler.ast.TryStatement.analyseCode(TryStatement.java:339)
at org.eclipse.jdt.internal.compiler.ast.MethodDeclaration.analyseCode(MethodDeclaration.java:129)
at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.internalAnalyseCode(TypeDeclaration.java:956)
at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.analyseCode(TypeDeclaration.java:304)
at org.eclipse.jdt.internal.compiler.ast.CompilationUnitDeclaration.analyseCode(CompilationUnitDeclaration.java:136)
at org.eclipse.jdt.internal.compiler.Compiler.process(Compiler.java:908)
at org.eclipse.jdt.internal.compiler.Compiler.processCompiledUnits(Compiler.java:575)
at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:475)
at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:426)
at com.ibm.ws.jsp.translator.compiler.JDTCompiler.compile(JDTCompiler.java:177)
```