TW-10076 allow to ignore commits where all files excluded by checkout rules Since 7.1 hg-plugin marks empty commits as cannot be ignored. We do that in order to show empty commits which close the branch. Since hg log doesn't contain any signs that commit closes branch, hg-plugin detects it by checking if commit has no changed files. We did that after applying checkout rules, as a result some commits with all files excluded were marked as cannot be ignored which is wrong. Now hg-plugin checks if commit is empty before applying checkout rules.

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