BUGS: in colorbar: divide-by-zero, and undesired masked array #8812
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Closes #8534 (divide-by-zero warning).
Also fixes a bug that became evident with #8801, which causes
pcolormesh to fail if X or Y is a masked array. Although masked
arrays are not supported by pcolormesh, previously it would ignore
the mask. Locators always return masked arrays, so t 8000 he present
commit explicitly converts to an ndarray the Locator output used
by proportional colorbars.