Use returncode to check if process failed

src/main/python/ddadevops/infrastructure/infrastructure.py

@@ -125,8 +125,8 @@ class ExecutionApi:
             outs, errs = process.communicate()
             while outs is not None:
                 stdout.buffer.write(outs)
-            if errs is not None:
-                raise RuntimeError(f"Execute live '{command}' failed with code {process.returncode}\n{errs}")
+            if process.returncode != 0:
+                raise RuntimeError(f"Execute live '{command}' failed with code {process.returncode}\nerrs: {errs}")
 
 
 class EnvironmentApi: