[HttpKernel] Fix FileLinkFormatter with empty xdebug.file_link_format #45298
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get_cfg_var('xdebug.file_link_format')can return'0'or''and$fileLinkFormatwill remain a string.Alternative: we could add
|stringto the$fileLinkFormatproperty, it's already the case in some other parts of the code, but for this class at least I find it better to not add another type.