Fix dump ASSERTION_FAILED (#5190)
Fix dump ASSERTION_FAILED (#5190)

"Exists check" might be called for objects without `TADIR` entry (like `NSPC`). 

Regression of #4952 which removed the "if"

https://github.com/abapGit/abapGit/commit/a72d3314cb839fdc0beaf1609714029a7a478327#diff-4a3135e0f538157951fefdea06986dc644f6005a2af7f6917ff7f7f2f771f622L299
larshp/abapGit,sbcgua/abapGit,larshp/abapGit,sbcgua/abapGit