Fix two edge cases in ResponseCacheStrategy#23129

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mpdude wants to merge 2 commits intosymfony:2.7from

webfactory:fix-handling-noncacheable-embedded-response

Commits on Jun 14, 2017

Fix two edge cases when merging private responses or responses with no caching information
mpdude
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894ae0d
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Undo negated test (mistakenly added while investigating yet another edge case)
mpdude
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78555a8
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