fix warnings

src/components/Blockly/blocks/logic.js

@@ -331,7 +331,7 @@ Blockly.Blocks['switch_case'] = {
                     }
                     break;
                 default:
-                    throw 'Unknown block type.';
+                    throw new Error('Unknown block type.');
             }
             caseBlock = caseBlock.nextConnection &&
                 caseBlock.nextConnection.targetBlock();
@@ -355,7 +355,7 @@ Blockly.Blocks['switch_case'] = {
                     caseBlock.satementConnection_ = defaultInput && defaultInput.connection.targetConnection;
                     break;
                 default:
-                    throw 'Unknown block type';
+                    throw new Error('Unknown block type');
             }
             caseBlock = caseBlock.nextConnection &&
                 caseBlock.nextConnection.targetBlock();

src/components/Blockly/blocks/sensebox-sd.js

@@ -64,7 +64,7 @@ Blockly.Blocks['sensebox_sd_write_file'] = {
         // Is the block nested in a loop?
         var block = this;
         do {
-            if (this.LOOP_TYPES.indexOf(block.type) != -1) {
+            if (this.LOOP_TYPES.indexOf(block.type) !== -1) {
                 legal = true;
                 break;
             }