Revert "Workarround completion date bug."
Revert "Workarround completion date bug."

This reverts commit e6809ccbad05dda2de20136adc15d817c81f668e.

@llopv @atfornes this was the original behaviour

I tried with undefined

https://github.com/P2Pvalue/teem/commit/dfd53eac0051d903007daf51ed6ff1fee5f6f52a#diff-2002a03c3db1745ce5bfb39c53e4f1a2L47

and deleting the property

https://github.com/P2Pvalue/teem/commit/85cc4f09ec1e4a040108014892a73f9885a58e73

The last one seemed to work, but there are many needs that still have
completionDate = ''

We need to check and uncheck them again so the property is properly
deleted

P2Pvalue/pear2pear,Grasia/teem,Grasia/teem,P2Pvalue/teem,Grasia/teem,P2Pvalue/teem,P2Pvalue/pear2pear,P2Pvalue/teem