Fix empty buffer case for Browser base64 encoding#131
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Currently, passing an empty blob to encodeBlobAsBase64 results in "bundefined" getting passed
to the callback, because fileReader.result returns "data:" instead of the expected format:
"data:application/octet-stream;base64,"
This fix turns an "undefined" into "" so the callback is sent "b" (with is correctly decodes to [] by
the receivers) instead of "bundefined", which decodes to [0xba, 0x77, 0x5e, 0x7e, 0x29, 0xde]