When format file does not exist, changing certain settings may result in errors #4645
Description
Describe the bug
After a recent update to the Syslog plugin, it was found that there are cases where if you attempt to use Cacti's format file functions when the format file does not exist, Cacti will generate warnings.
To Reproduce
Steps to reproduce the behavior:
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Create a report that uses a standard cacti format file, then in the database, clear the format file. Make it blank.
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Generate the report
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Goto the Cacti log and see the errors.
Expected behavior
Cacti should use the default or return an error if the default is not present.