[Validator] check for empty host when calling checkdnsrr()#22109

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apetitpa wants to merge 16 commits intosymfony:masterfrom

apetitpa:fix-email-validator

Commits on Mar 27, 2017

[Validator] Allow checkMX() to return false when $host is empty

apetitpa
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Add empty check on host in other methods + add unit tests

apetitpa
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Remove malformed EmailValidatorTest + Update UrlValidator test

apetitpa
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fix coding standard to comply with fabbot

apetitpa
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Use LF line separator

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Move empty condition in return statement

apetitpa
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Add a test case to prevent future regressions

apetitpa
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Remove unnecessary parentheses

apetitpa
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Switch to `is_string` native method
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remove non relevant test case
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Switch to `empty` native function to check emptiness
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Add a test to prevent future regressions
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rename dataset provider
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cast substr result to string and remove empty function use
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update dataProvider function name
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move provider after test
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