Created by: mkszuba
Description
Shift the numbering of checksum xrefs to be inserted by ChecksumParser by one. Also, check if the temporary output file has successfully been opened before attempting to use it.
Use case
The way ChecksumParser calculates values of checksum_xref_id now causes it to lose one such xref per input file; see the commit message for details. May or may not be related to ENSCORESW-3196.
Benefits
Will stop losing RNAcentral and UniParc xrefs.
Possible Drawbacks
None.
Testing
Have you added/modified unit tests to test the changes?
No.
If so, do the tests pass/fail?
N/A
Have you run the entire test suite and no regression was detected?
No, ChecksumParser is not covered by the test suite.