Fix situations where using :name and :show would error or not show.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 30.00000% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 66.86%. Comparing base (cb68d5f) to head (dca2f82).

Files	Patch %	Lines
src/pcolor.jl	30.00%	7 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1408 +/- ## =========================================== - Coverage 90.95% 66.86% -24.09% =========================================== Files 134 134 Lines 17298 17071 -227 =========================================== - Hits 15733 11415 -4318 - Misses 1565 5656 +4091 ```

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