Merge pull request #683 from roadkill001/master

Fix for STORM_JAR_JVM_OPTS which is currently broken when STORM_JAR_JVM_OPTS is not specified
diff --git a/bin/storm b/bin/storm
index bd90b8f..444fb8b1 100755
--- a/bin/storm
+++ b/bin/storm
@@ -139,7 +139,7 @@
         jvmtype="-client",
         extrajars=[jarfile, USER_CONF_DIR, STORM_DIR + "/bin"],
         args=args,
-        jvmopts=[JAR_JVM_OPTS + " -Dstorm.jar=" + jarfile])
+        jvmopts=[' '.join(filter(None, [JAR_JVM_OPTS, "-Dstorm.jar=" + jarfile]))])
 
 def kill(*args):
     """Syntax: [storm kill topology-name [-w wait-time-secs]]