Fix Package.should_have_pointer_file()

Before this, this method was incorrectly returning `True` if the package
was an AIP (or AIC) even if it was not a file (i.e., was not
compressed).

storage_service/locations/models/package.py

@@ -561,7 +561,7 @@ def should_have_pointer_file(self, package_full_path=None,
             package_type = self.package_type
         isfile = os.path.isfile(package_full_path)
         isaip = package_type in (Package.AIP, Package.AIC)
-        ret = isfile or isaip
+        ret = isfile and isaip
         if not ret:
             if not isfile:
                 LOGGER.info('Package should not have a pointer file because %s'