More informative warning if an error occurs
More informative warning if an error occurs

git-svn-id: https://svn.apache.org/repos/asf/jmeter/trunk@1695709 13f79535-47bb-0310-9956-ffa450edef68

Former-commit-id: 3337eb31176975bad0cd68aea2c54a0ee30567f0
etnetera/jmeter,etnetera/jmeter,benbenw/jmeter,ham1/jmeter,ham1/jmeter,ham1/jmeter,etnetera/jmeter,benbenw/jmeter,benbenw/jmeter,apache/jmeter,apache/jmeter,apache/jmeter,ham1/jmeter,apache/jmeter,ham1/jmeter,etnetera/jmeter,apache/jmeter,etnetera/jmeter,benbenw/jmeter