move NIC retrieval in try-catch

Author: Alexandru Bagu

server/src/main/java/com/cloud/vm/UserVmManagerImpl.java

@@ -763,12 +763,12 @@ public VmIpAddrFetchThread(long vmId, String vmUuid, long nicId, String instance
 
         @Override
         protected void runInContext() {
-            NicVO nic = _nicDao.findById(nicId);
-            GetVmIpAddressCommand cmd = new GetVmIpAddressCommand(vmName, networkCidr, nic.getMacAddress(), isWindows);
             boolean decrementCount = true;
 
             try {
                 logger.debug("Trying IP retrieval for VM [id: {}, uuid: {}, name: {}], nic {}", vmId, vmUuid, vmName, nic);
+                NicVO nic = _nicDao.findById(nicId);
+                GetVmIpAddressCommand cmd = new GetVmIpAddressCommand(vmName, networkCidr, nic.getMacAddress(), isWindows);
                 Answer answer = _agentMgr.send(hostId, cmd);
                 if (answer.getResult()) {
                     String vmIp = answer.getDetails();