Bug #69297 for Test-Compile: Skip if there are no 'pl' files to test

I'd love to be able to put 't/00-compile.t' and 't/00-compile-scripts.t' files in all my projects (as documented in the pod) - but if there are no pl files in a project, the 't/00-compile-scripts.t' test file outputs the following: Use of uninitialized value $file in -d at /usr/share/perl5/Test/Compile.pm line 138. Use of uninitialized value $file in -f at /usr/share/perl5/Test/Compile.pm line 154. You said to run 0 tests at t/00-load-scripts.t line 6. This is considered 'dubious' by the testing tools (prove, etc), meaning the test result is "FAIL". Ideally, all_pl_files_ok() should automatically skip if it can't find any pl_files to test.