Fixes #26136: Avoid emitting warning in hasParameterOption()#26156

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greg-1-anderson wants to merge 4 commits intosymfony:2.7from

greg-1-anderson:guard-invalid-hasparamopt

Commits on Feb 12, 2018

Fixes #26136: Avoid emitting warning when hasParameterOption / getParameterOption is passed invalid parameters.
greg-1-anderson
committed

Commits on Feb 13, 2018

Use a !== yoda-conditional instead of 'empty' to match Symfony code style.
greg-1-anderson
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Commits on Feb 14, 2018

Test to ensure that getParameterOption / hasParameterOption throws no warnings.
greg-1-anderson
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Commits on Feb 15, 2018

Fix type of expected value in getParameterOption test.
greg-1-anderson
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