Init empty array for List experiments response #55
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What this PR does / why we need it: This is a minor bugfix for the List Experiments API when 0 records are selected from the DB. We subsequently iterate over the experiments and copy only the required fields (specified by the field selector, if set), to a new array. However, this array was previously uninitialised, leading to
"data": null
as opposed to"data": []
in the response. (This is implemented correctly for other entities like Segments and Treatments already.)