fix 7320: we can't delete a trailing space if it doesn't exist.

llvm-svn: 113125

clang/lib/Lex/Pragma.cpp

@@ -384,6 +384,8 @@ void Preprocessor::HandlePragmaDependency(Token &DependencyTok) {
       Lex(DependencyTok);
     }
 
+    // Remove the trailing ' ' if present.
+    if (!Message.empty())
       Message.erase(Message.end()-1);
     Diag(FilenameTok, diag::pp_out_of_date_dependency) << Message;
   }