Add fix for DateColumn when empty

[lrljoe]

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 36.36364% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 86.54%. Comparing base (b114094) to head (cf479b9). Report is 21 commits behind head on develop.

:exclamation: Current head cf479b9 differs from pull request most recent head 9b1f9f3

Please upload reports for the commit 9b1f9f3 to get more accurate results.

Files	Patch %	Lines
src/Commands/MakeCommand.php	0.00%	6 Missing :warning:
src/Views/Columns/DateColumn.php	80.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #1726 +/- ## ============================================= - Coverage 88.13% 86.54% -1.59% - Complexity 1310 1349 +39 ============================================= Files 123 124 +1 Lines 3102 3197 +95 ============================================= + Hits 2734 2767 +33 - Misses 368 430 +62 ```

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