CLOUDSTACK-9071: Properly parse stats.output.uri in StatsCollector

Both host and path could have been NULL which causes the StatsCollector
no to start properly.

By checking if the Strings are not Empty or Null we make sure the StatsCollector
always runs and does not prevent the Management Server from starting.

Signed-off-by: Wido den Hollander <wido@widodh.nl>

Conflicts:
	server/src/com/cloud/server/StatsCollector.java

Author: wido

server/src/com/cloud/server/StatsCollector.java

@@ -34,6 +34,7 @@
 import javax.inject.Inject;
 
 import org.apache.cloudstack.utils.usage.UsageUtils;
+import org.apache.commons.lang.StringUtils;
 import org.apache.log4j.Logger;
 import org.springframework.stereotype.Component;
 
@@ -271,12 +272,18 @@ private void init(Map<String, String> configs) {
                     s_logger.info(scheme + " is not a valid protocol for external statistics. No statistics will be send.");
                 }
 
-                externalStatsHost = uri.getHost();
+                if (!StringUtils.isEmpty(uri.getHost())) {
+                    externalStatsHost = uri.getHost();
+                }
+
                 externalStatsPort = uri.getPort();
-                externalStatsPrefix = uri.getPath().substring(1);
+
+                if (!StringUtils.isEmpty(uri.getPath())) {
+                    externalStatsPrefix = uri.getPath().substring(1);
+                }
 
                 /* Append a dot (.) to the prefix if it is set */
-                if (externalStatsPrefix != null && !externalStatsPrefix.equals("")) {
+                if (!StringUtils.isEmpty(externalStatsPrefix)) {
                     externalStatsPrefix += ".";
                 } else {
                     externalStatsPrefix = "";