Fix new regions check.

Author: wparad

lib/CloudFormationDeployer.js

@@ -377,7 +377,7 @@ class CloudFormationDeployer {
     const newRegions = options.regions.filter(r => !existingRegions.some(e => e === r));
 
     // If the stack already existed, and there are no new regions, all the stacks are updated then check to see if the template matches the new template
-    if (stackExists && !newRegions && existingStacks.every(s => s.Status === 'CURRENT')) {
+    if (stackExists && !newRegions.length && existingStacks.every(s => s.Status === 'CURRENT')) {
       const regionStacks = await this.cloudFormationClient.listStacks({ StackStatusFilter: ['CONFIGURATION_COMPLETE', 'CREATE_COMPLETE', 'UPDATE_COMPLETE', 'UPDATE_ROLLBACK_COMPLETE'] }).promise()
       .then(r => r.StackSummaries);