Add a null check for response message context to skip engaging interceptors #2125
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Purpose
This PR adds a null check for response message context to skip engaging the streaming interceptors. This value becomes null in a passthru scenario when a request payload with a large content length is sent to a backend which does not support chunking. Since this occurs only in such a scenario, we can skip engaging the interceptors based on the null check.
Related issue: https://github.com/wso2-enterprise/wso2-apim-internal/issues/5221
Fixes: wso2/api-manager#2343