[tests] specify exceptions (new flake8 moan)

Author: jcb91

tests/test_application.py

@@ -165,7 +165,7 @@ def _check_subproc(self, args):
             args, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
         try:
             output, unused_err = proc.communicate()
-        except:
+        except subprocess.CalledProcessError:
             proc.kill()
             proc.wait()
             raise