Test metrics are no longer pushed to Comet.ML (and perhaps others)
🐛 Bug
PyTorch Lightning 0.7.2 used to publish test metrics to Comet.ML.  Commit ddbf7de has broken this functionality.
To Reproduce
Steps to reproduce the behavior:
Run fast-run of training and observe test metrics not being submitted to Comet.ML (and possibly other logging destinations).
Environment
cuda:
        GPU:
                Tesla T4
        available:           True
        version:             10.1
packages:
        numpy:               1.17.2
        pyTorch_debug:       False
        pyTorch_version:     1.4.0
        pytorch-lightning:   0.7.4-dev
        tensorboard:         2.2.0
        tqdm:                4.45.0
system:
        OS:                  Linux
        architecture:
                64bit

        processor:           x86_64
        python:              3.6.8
        version:             #69-Ubuntu SMP Thu Mar 26 02:17:29 UTC 2020

cc @alexeykarnachev