Resolve #3269845 "Passing null to parameter #1 ($string) of type string is deprecated in _responsive_image_build_source_attributes()"

added 76 commits

• 3ddfb118...1c773fed - 75 commits from branch project:11.x
• cf5fd21b - Merge branch '11.x' of github.com:drupal/drupal into 3269845-trim-passing-null-deprecated

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added 181 commits

• cf5fd21b...68bf822f - 177 commits from branch project:11.x
• 570bdb6a - Apply patch from #25
• 7ca78c6b - Make Breakpoint::getMediaQuery() always return a trimmed string (proposed in #18)
• b49859fc - Add tests
• 62ae848a - Improve the public interface of the Breakpoint class by adding a hasMediaQuery() method to it

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