Fix bug with compiled views in compiled-only apps

Compiled views were not being executed in apps containing only compiled
files (i.e., generated via the admin "Pack compiled" functionality),
resulting in "Invalid view" errors for all pages.

gluon/compileapp.py

@@ -709,23 +709,22 @@ def run_view_in(environment):
                         ccode = getcfs(compiled, compiled, lambda: read_pyc(compiled))
                         layer = compiled
                         break
-        if not os.path.exists(filename) and allow_generic:
-            view = 'generic.' + request.extension
-            filename = pjoin(folder, 'views', view)
-        if not os.path.exists(filename):
-            raise HTTP(404,
-                       rewrite.THREAD_LOCAL.routes.error_message % badv,
-                       web2py_error=badv)
-
         # if the view is not compiled
         if not layer:
+            if not os.path.exists(filename) and allow_generic:
+                view = 'generic.' + request.extension
+                filename = pjoin(folder, 'views', view)
+            if not os.path.exists(filename):
+                raise HTTP(404,
+                           rewrite.THREAD_LOCAL.routes.error_message % badv,
+                           web2py_error=badv)
             # Parse template
             scode = parse_template(view,
                                    pjoin(folder, 'views'),
                                    context=environment)
             # Compile template
             ccode = compile2(scode, filename)
-        layer = filename
+            layer = filename
     restricted(ccode, environment, layer=layer, scode=scode)
     # parse_template saves everything in response body
     return environment['response'].body.getvalue()