* params/metrics/plots/exp show: introduce onerror
* fixup
* plots/metrics/params: removing errors
* removing more errors
* removing errors
* some more removing
* new plots ux
* new ux for metrics
* new ux for params
* fixing tests
* fixups
* minor test fixes
* minor test fixes
* commands: plots/params: fix ui imports
* working on error handlng decorator, stopped at show checkpoints
* error_handler, further dvelopment
* plots just before moving loading to collect
* appending errors to results: initial passing
* fixup
* onerror: remove onerror fixture
* fixups
* plots/metrics/params/experiments: temporarily remove error warnings
* plots: extract parsing out of class method
* metrics/experiments: provide exception serializer for show-json
* params/plots/metrics: signal errors
* rebase fixups
* fix TODOs
* fixup
* skshetry's review refactor