Bring in GeoGridDataSource NPE fix. [0]

This is from
https://github.com/Unidata/IDV/commit/c77f2d0fe7d234e290dfd94964a81587e2
a1acf5
Bring ViewManager up to date with IDV version. [0]

The code is essentially unchanged due to the IDV change being from my
pull request.
Fix whitespace diffs in MapViewManager. [0]

No code changes—this is just to make diff tools happy.