fix python flask controller without tag (default_controller)

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/FlaskConnexionCodegen.java

@@ -145,10 +145,6 @@ public class FlaskConnexionCodegen extends DefaultCodegen implements CodegenConf
         }
 
         if(!new java.io.File(controllerPackage + File.separator + defaultController + ".py").exists()) {
-            //supportingFiles.add(new SupportingFile("controller.mustache",
-            //                controllerPackage,
-            //                defaultController + ".py")
-            //);
             supportingFiles.add(new SupportingFile("__init__.mustache",
                             controllerPackage,
                             "__init__.py")
@@ -269,7 +265,7 @@ public class FlaskConnexionCodegen extends DefaultCodegen implements CodegenConf
                         }
                         else {
                             // no tag found, use "default_controller" as the default
-                            String tag = "default_controller";
+                            String tag = "default";
                             operation.setTags(Arrays.asList(tag));
                             controllerName = tag + "_controller";
                         }

samples/server/petstore/flaskConnexion/swagger/swagger.yaml

@@ -644,6 +644,8 @@ definitions:
       complete:
         type: "boolean"
         default: false
+    title: "Pet Order"
+    description: "An order for a pets from the pet store"
     xml:
       name: "Order"
   Category:
@@ -654,6 +656,8 @@ definitions:
         format: "int64"
       name:
         type: "string"
+    title: "Pet catehgry"
+    description: "A category for a pet"
     xml:
       name: "Category"
   User:
@@ -678,6 +682,8 @@ definitions:
         type: "integer"
         format: "int32"
         description: "User Status"
+    title: "a User"
+    description: "A User who is purchasing from the pet store"
     xml:
       name: "User"
   Tag:
@@ -688,6 +694,8 @@ definitions:
         format: "int64"
       name:
         type: "string"
+    title: "Pet Tag"
+    description: "A tag for a pet"
     xml:
       name: "Tag"
   Pet:
@@ -725,6 +733,8 @@ definitions:
         - "available"
         - "pending"
         - "sold"
+    title: "a Pet"
+    description: "A pet for sale in the pet store"
     xml:
       name: "Pet"
   ApiResponse:
@@ -737,6 +747,8 @@ definitions:
         type: "string"
       message:
         type: "string"
+    title: "An uploaded response"
+    description: "Describes the result of uploading an image resource"
 externalDocs:
   description: "Find out more about Swagger"
   url: "http://swagger.io"