[bp/r65938][FIX] h5p: Prevent notices when running from CLI 
[bp/r65940][FIX] trackers: notices fixed in r65939 meant that missing files attached to tracker items were not being reported as missing, so add some feedback - this should be improved... 
[bp/r65939][FIX] various notices 
[bp/r65956][FIX] notices: Check for numeric val in sub fn 
[bp/r65957][FIX] notices: No need to clean_xml on empty data (loadXML issues a warning)