Panics/errors on previous benchmarks should be ignored

[dcu]

When the benchmarks in the base commit fails they should be just ignored and not make everything fail

[knqyf263]

I'm sorry for the late reply. Now, cob ignores "no packages to test" error. Let me know other failing case, please. I can't imagine how the base commit fails for any other reason.

[dcu]

this can be produced if the benchmark has a fixed dependency that changed or was broken with the time