Fixes for the cases when grid/array is float and has NaNs

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 62.26415% with 20 lines in your changes are missing coverage. Please review.

Project coverage is 90.83%. Comparing base (6400332) to head (e2ad4c2).

Files	Patch %	Lines
src/utils.jl	52.77%	17 Missing :warning:
src/pshistogram.jl	78.57%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1395 +/- ## ========================================== + Coverage 90.13% 90.83% +0.70% ========================================== Files 134 134 Lines 17186 17226 +40 ========================================== + Hits 15491 15648 +157 + Misses 1695 1578 -117 ```

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