Remove unnecessary line (#2385)

Fixes #2306

Author: schmmd

allennlp/models/model.py

@@ -171,7 +171,6 @@ def forward_on_instances(self,
                 elif len(output) != batch_size:
                     self._maybe_warn_for_unseparable_batches(name)
                     continue
-                outputs[name] = output
                 for instance_output, batch_element in zip(instance_separated_output, output):
                     instance_output[name] = batch_element
             return instance_separated_output