remove whitespace printed after every command execution

The POST handling logic didn't check for empty responses before
printing its contents resulting in a line of whitespace being
written in the output of the program.

cli/cli.py

@@ -47,7 +47,9 @@ class OgREST():
             r = requests.post(f'{self.URL}{path}',
                               headers=self.HEADERS,
                               json=payload)
-            print(r.text)
+            if r.text:
+                print(r.text)
+
             if r.status_code not in {200, 202}:
                 sys.exit(f"Unsuccessful request to ogServer: "
                          f"Response with {r.status_code} HTTP status code")