Do not crash on SHARED library without language (#13324)
Since commit e1409ac5 (Support building shared libraries or modules without soname, 2012-04-22) CMake crashes on the code add_library(foo SHARED foo.nolang) because the logic to lookup the language's soname flag was moved from cmTarget::GetLibraryNames to cmMakefile::GetSONameFlag without its check for a NULL language. Restore the check for NULL. Add RunCMake.Languages test to cover language error cases like this one.
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