Bug 56198 - JMSSampler : NullPointerException is thrown when JNDI underlying implementation of JMS provider does not comply with Context.getEnvironment contract
Apply check on every call of Context.getEnvironment
Bugzilla Id: 56198

git-svn-id: https://svn.apache.org/repos/asf/jmeter/trunk@1573108 13f79535-47bb-0310-9956-ffa450edef68