Adds error checking for peacock Outputs block loading. Addresses #3026

Remove trailing whitespace in fix for #3026

Updated code comment in fix for #3026

Adds error checking for peacock Outputs block loading. Addresses #3026
Merge pull request #3028 from bobkinl/fix_3026

Adds error checking for peacock Outputs block loading.
Merge commit '9533627ff2dbb16c4ae64965c78424318196c686'