improve workspace error handling #1709
Merged
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We now show an informative error in the workspace for errors somewhere in the lazy tree view display:

This also only special cases

BasesArrayandDicttypes instead of allAbstractArrays andAbstractDicts, so that e.g.ODESolutionsare displayed properly:It also makes super duper extra sure that every index is assigned when showing arrays -- in theory this shouldn't be necessary since
prod(size(x)) == length(eachindex(x))holds forArrays, but can't hurt either.