fixed null pointer in the initial operations

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/service/DeviceManagementProviderServiceImpl.java

@@ -2114,22 +2114,25 @@ public class DeviceManagementProviderServiceImpl implements DeviceManagementProv
         deviceIdentifiers.add(deviceIdentifier);
         if (init != null) {
             List<String> initialOperations = init.getOperations();
-
-            for (String str : initialOperations) {
-                CommandOperation operation = new CommandOperation();
-                operation.setEnabled(true);
-                operation.setType(Operation.Type.COMMAND);
-                operation.setCode(str);
-                try {
-                    deviceManagementProviderService.
-                            addOperation(deviceType,
-                                    operation, deviceIdentifiers);
-                } catch (OperationManagementException e) {
-                    throw new DeviceManagementException("Unable to find the device with the id: '" + deviceIdentifier.getId(),
-                            e);
-                } catch (InvalidDeviceException e) {
-                    throw new DeviceManagementException("Unable to find the device with the id: '" + deviceIdentifier.getId(),
-                            e);
+            if (initialOperations != null) {
+                for (String str : initialOperations) {
+                    CommandOperation operation = new CommandOperation();
+                    operation.setEnabled(true);
+                    operation.setType(Operation.Type.COMMAND);
+                    operation.setCode(str);
+                    try {
+                        deviceManagementProviderService.
+                                addOperation(deviceType,
+                                             operation, deviceIdentifiers);
+                    } catch (OperationManagementException e) {
+                        throw new DeviceManagementException(
+                                "Unable to find the device with the id: '" + deviceIdentifier.getId(),
+                                e);
+                    } catch (InvalidDeviceException e) {
+                        throw new DeviceManagementException(
+                                "Unable to find the device with the id: '" + deviceIdentifier.getId(),
+                                e);
+                    }
                 }
             }
         }