Tpetra: possible optimization when removing zeros

[jhux2]

Enhancement

This is a potential follow-up to #11604. In removeCrsMatrixZeros there should be a check whether any zeros were actually removed. If not, then the function can just return early.

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[brian-kelley]

@jhux2 I think #11715 took care of this, can it be closed?

[jhux2]

@brian-kelley Yep, thanks!