bd5b9f0a12dd9c1947b11534e99c395ddf44caa9
Show is documented to be program-parseable, and printing the warning about about a non-existent unit, while useful for humans, broke a lot of scripts. Restore previous behaviour of returning success and printing empty or useless stuff for units which do not exist, and printing empty values for properties which do not exists. With SYSTEMD_LOG_LEVEL=debug, hints are printed, but the return value is still 0. This undoes parts ofe33a06aand3dced37b7and fixes #3856. We might consider adding an explicit switch to fail on missing units/properties (e.g. --ensure-exists or similar), and make -P foobar equivalent to --ensure-exists --property=foobar.
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