Fixed Broken #4629
Fixed Broken #4629

Fixed #4629 - Broken `0` edge case in `WP_CLI\Utils\is_json()`
trepmal/wp-cli,GaryJones/wp-cli,rodrigoprimo/wp-cli,rodrigoprimo/wp-cli,aaemnnosttv/wp-cli,rodrigoprimo/wp-cli,GaryJones/wp-cli,trepmal/wp-cli,aaemnnosttv/wp-cli,2ndkauboy/wp-cli,2ndkauboy/wp-cli,GaryJones/wp-cli,aaemnnosttv/wp-cli,trepmal/wp-cli,2ndkauboy/wp-cli