[release/v1.2] Fix catch-up subscription onCancelled on leader change#397

w1am merged 2 commits into

release/v1.2kurrent-io/KurrentDB-Client-Java:release/v1.2from

cherry-pick/396/w1am/dev-1817-java-client-notleader-redirect-npes-in-readresponseobserver-release/v1.2kurrent-io/KurrentDB-Client-Java:cherry-pick/396/w1am/dev-1817-java-client-notleader-redirect-npes-in-readresponseobserver-release/v1.2Copy head branch name to clipboard