Fix typescript errors

Author: alan412

src/blocks/mrc_call_python_function.ts

@@ -705,7 +705,7 @@ const CALL_PYTHON_FUNCTION = {
       // Add a warnings to the block.
       const warningText = warnings.join('\n\n');
       this.setWarningText(warningText, WARNING_ID_FUNCTION_CHANGED);
-      this.getIcon(Blockly.icons.IconType.WARNING).setBubbleVisible(true);
+      this.getIcon(Blockly.icons.IconType.WARNING)!.setBubbleVisible(true);
       this.bringToFront();
     } else {
       // Clear the existing warning on the block.

src/blocks/mrc_event.ts

@@ -207,7 +207,7 @@ const EVENT = {
         // If we end up here it shouldn't be allowed
         block.unplug(true);
         blockBlock.setWarningText('Events can only go in the events section of the robot or mechanism');
-        blockBlock.getIcon(Blockly.icons.IconType.WARNING).setBubbleVisible(true);
+        blockBlock.getIcon(Blockly.icons.IconType.WARNING)!.setBubbleVisible(true);
       }
     },
     getEvent: function (this: EventBlock): commonStorage.Event {

src/blocks/mrc_event_handler.ts

@@ -204,7 +204,7 @@ const EVENT_HANDLER = {
       // Add a warnings to the block.
       const warningText = warnings.join('\n\n');
       this.setWarningText(warningText, WARNING_ID_EVENT_CHANGED);
-      this.getIcon(Blockly.icons.IconType.WARNING).setBubbleVisible(true);
+      this.getIcon(Blockly.icons.IconType.WARNING)!.setBubbleVisible(true);
       this.bringToFront();
     } else {
       // Clear the existing warning on the block.

src/blocks/mrc_get_parameter.ts

@@ -90,7 +90,7 @@ const GET_PARAMETER_BLOCK = {
       // If we end up here it shouldn't be allowed
       block.unplug(true);
       blockBlock.setWarningText(Blockly.Msg.PARAMETERS_CAN_ONLY_GO_IN_THEIR_METHODS_BLOCK);
-      blockBlock.getIcon(Blockly.icons.IconType.WARNING).setBubbleVisible(true);
+      blockBlock.getIcon(Blockly.icons.IconType.WARNING)!.setBubbleVisible(true);
     }
   },
 };

src/blocks/mrc_mechanism.ts

@@ -210,7 +210,7 @@ const MECHANISM = {
       // Add a warnings to the block.
       const warningText = warnings.join('\n\n');
       this.setWarningText(warningText, WARNING_ID_MECHANISM_CHANGED);
-      this.getIcon(Blockly.icons.IconType.WARNING).setBubbleVisible(true);
+      this.getIcon(Blockly.icons.IconType.WARNING)!.setBubbleVisible(true);
       this.bringToFront();
     } else {
       // Clear the existing warning on the block.