Don't catch ParameterValueError after persisting values in database

[mvdbeek]

params_from_strings is called from within the compute environment, where we generate the command line, which is after we've persisted job parameters:

galaxy/lib/galaxy/tools/evaluation.py

Line 137 in 5addd00

incoming = self.tool.params_from_strings(incoming, self.app)

This is too late to decide to skip or null parameter values. Luckily it seems this isn't needed (anymore ?) as all tests are passing.

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