225 solve checker bugs

[carlosmada22]

All the bugs presented here were solved. There is a minor bug affecting how the vocabularies are read ([terms] key problem), that should be solved in another issue. Can you do this meanwhile I am not here @JosePizarro3 ?

[coveralls]

Pull Request Test Coverage Report for Build 19043800814

Details

• 11 of 19 (57.89%) changed or added relevant lines in 3 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.04%) to 60.043%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
bam_masterdata/checker/source_loader.py	3	5	60.0%
bam_masterdata/checker/masterdata_validator.py	0	6	0.0%

Files with Coverage Reduction	New Missed Lines	%
bam_masterdata/checker/source_loader.py	1	90.0%

Totals
Change from base Build 18934733534:	0.04%
Covered Lines:	1130
Relevant Lines:	1882

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💛 - Coveralls