[ABW]: tests for muting as well as some negative for bridge.get_discussion

...bridge_api_negative/get_discussion/bad_observer.orig.json

.../bridge_api_negative/get_discussion/bad_observer.pat.json

...idge_api_negative/get_discussion/bad_observer.tavern.yaml

...rn/bridge_api_negative/get_discussion/no_author.orig.json

...ern/bridge_api_negative/get_discussion/no_author.pat.json

.../bridge_api_negative/get_discussion/no_author.tavern.yaml

.../bridge_api_negative/get_discussion/no_permlink.orig.json

...n/bridge_api_negative/get_discussion/no_permlink.pat.json

...ridge_api_negative/get_discussion/no_permlink.tavern.yaml

...api_negative/get_discussion/not_existing_author.orig.json

..._api_negative/get_discussion/not_existing_author.pat.json

...i_negative/get_discussion/not_existing_author.tavern.yaml

...i_negative/get_discussion/not_existing_observer.orig.json

...pi_negative/get_discussion/not_existing_observer.pat.json

...negative/get_discussion/not_existing_observer.tavern.yaml

...avern/bridge_api_patterns/get_discussion/chitty.orig.json

...tavern/bridge_api_patterns/get_discussion/chitty.pat.json

...ern/bridge_api_patterns/get_discussion/chitty.tavern.yaml

...ridge_api_patterns/get_discussion/mutes_comments.pat.json

...ge_api_patterns/get_discussion/mutes_comments.tavern.yaml