Fix: get all PIDs of prefix

[Pfeil]

Writing all PIDs to a CSV file was not working since the prefix in the meanwhile always includes a slash at the end, which needs to be removed in this special case.

• fixed issue
• improved error messages
• tested locally

[coveralls]

Pull Request Test Coverage Report for Build #498

Details

• 0 of 4 (0.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.08%) to 72.4%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/main/java/edu/kit/datamanager/pit/pidsystem/impl/HandleProtocolAdapter.java	0	4	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/main/java/edu/kit/datamanager/pit/pidsystem/impl/HandleProtocolAdapter.java	1	33.61%

Totals
Change from base Build #497:	0.08%
Covered Lines:	884
Relevant Lines:	1221

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💛 - Coveralls