ringphp-guzzle-handler
                                
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                        Update GuzzleHandler.php
This updates the emptyResposne return value to use an empty string for effective_url instead of null.  There was a TypeError being thrown by PHP due to Guzzle using the effective_url in a function that only allowed string.
Closes #10
Is there anything else I can do to help move this PR along?
Also looking forward for this. @lukewaite :eyes: