Tests: FIXUP wrapper script.

Author: xoviat

tests/scripts/appveyor/fixup_wrapper.py

@@ -10,12 +10,14 @@
 
 wrapper_file.seek(pos)
 
-wrapper = json.loads(wrapper_file.read())
+wrapper = json.load(wrapper_file)
 
 for i, item in enumerate(wrapper['captures']):
-    wrapper['captures'][i]['stdout'] = wrapper['captures'][0]['stdout']
-    wrapper['captures'][i]['stderr'] = wrapper['captures'][0]['stderr']
+    if not wrapper['captures'][i]['stdout']:
+        wrapper['captures'][i]['stdout'] = wrapper['captures'][0]['stdout']
+    if not wrapper['captures'][i]['stderr']:
+        wrapper['captures'][i]['stderr'] = wrapper['captures'][0]['stderr']
 
 wrapper_file.seek(0)
 wrapper_file.truncate()
-wrapper_file.write(json.dumps(wrapper))
+json.dumps(wrapper, wrapper_file, indent=4)