Conditionally skip external connection adapters if lib is not installed
Conditionally skip external connection adapters if lib is not installed

renshawbay/pika-python3,vitaly-krugl/pika,knowsis/pika,jstnlef/pika,skftn/pika,pika/pika,zixiliuyue/pika,vrtsystems/pika,reddec/pika,shinji-s/pika,Zephor5/pika,benjamin9999/pika,fkarb/pika-python3,hugoxia/pika,Tarsbot/pika