In TH1::Divide, in case nEntries of "this" histogram is null, set it to the number of entries in the first operand histogram. If it is still null, set it to 1.
In TH1::Divide, in case nEntries of "this" histogram is null,
set it to the number of entries in the first operand histogram.
If it is still null, set it to 1.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@7396 27541ba8-7e3a-0410-8455-c3a389f83636

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