Merge branch 'issue38' into 'master'

use an updated commit of glmtools that handles empty data scenes

Closes #38

See merge request !29

buildbucket/buildbucket_environment.yaml

@@ -27,5 +27,5 @@ dependencies:
   - pip:
     - git+https://github.com/deeplycloudy/lmatools.git@1501be30c32b948a3ecd56adf1dfb2fc57316346
     - git+https://github.com/deeplycloudy/stormdrain.git@3620621267215bf84b1f5199b4f395b430f309fc
-    - git+https://github.com/deeplycloudy/glmtools.git@33490be8df01622f950733faa77998da43f47b0a
+    - git+https://github.com/nbearson/glmtools.git@c61202aaaabd91b96cb98b5af7c59f05486cf4c6
     - git+https://github.com/pytroll/satpy.git@v0.36.0
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