Fix crash on importing Java code attached to bug 368453: The example uses the global scope and JavaImport crashes on adding objects in the global scope without prior defined Java package.

umbrello/codeimport/import_utils.{h,cpp}

• Add function globalScope() returning the package of the global scope.

umbrello/codeimport/nativeimportbase.cpp

• In function parseFile() do not push a null pointer as the global scope; instead, push Import_Utils::globalScope().

CCBUG:368453