Look up variable by name if not found by ID

core/variables.js

@@ -539,7 +539,13 @@ Blockly.Variables.getVariable = function(workspace, id, opt_name, opt_type) {
     if (!variable && potentialVariableMap) {
       variable = potentialVariableMap.getVariableById(id);
     }
-  } else if (opt_name) {
+    if (variable) {
+      return variable;
+    }
+  }
+  // If there was no ID, or there was an ID but it didn't match any variables,
+  // look up by name and type.
+  if (opt_name) {
     if (opt_type == undefined) {
       throw Error('Tried to look up a variable by name without a type');
     }