Suppress no test ran exit code when running 0 tests

Author: humitos

.travis.yml

@@ -10,7 +10,7 @@ before_install:
 install:
   - pipenv install
 script:
-  - pipenv run pytest
+  - pipenv run pytest --suppress-no-test-exit-code
   - docker build .
 
 branches:

Pipfile

@@ -9,4 +9,5 @@ name = "pypi"
 
 "dockerfile-parse" = "*"
 requests = "*"
-pytest = "*"
+pytest = "*"
+pytest-custom-exit-code = "*"