Fixed Sparkplug B python example to show error on failure to connect
Fixed Sparkplug B python example to show error on failure to connect

Cirrus-Link/Sparkplug,Cirrus-Link/Sparkplug,Cirrus-Link/Sparkplug,Cirrus-Link/Sparkplug,Cirrus-Link/Sparkplug,Cirrus-Link/Sparkplug,Cirrus-Link/Sparkplug