Handle better the many ways information can be passed around (#27506)

* Handle better the many ways information can be passed around

* Fixing pep8 complaints

* Removing message

lib/ansible/plugins/callback/selective.py

@@ -154,12 +154,12 @@ class CallbackModule(CallbackBase):
             print("{} {}".format(line, '-' * (line_length - len(line))))
             print(self._indent_text(msg, indent_level + 4))
 
-        if diff is not None:
+        if diff:
             self._print_diff(diff, indent_level)
-        if stdout is not None:
+        if stdout:
             stdout = colorize(stdout, 'failed')
             print(self._indent_text(stdout, indent_level + 4))
-        if stderr is not None:
+        if stderr:
             stderr = colorize(stderr, 'failed')
             print(self._indent_text(stderr, indent_level + 4))
 
@@ -174,8 +174,8 @@ class CallbackModule(CallbackBase):
 
     def v2_runner_on_ok(self, result, **kwargs):
         """Run when a task finishes correctly."""
-        failed = 'failed' in result._result
-        unreachable = 'unreachable' in result._result
+        failed = result._result.get("failed")
+        unreachable = result._result.get("unreachable")
 
         if 'print_action' in result._task.tags or failed or unreachable or \
                 self._display.verbosity > 1:
@@ -183,6 +183,11 @@ class CallbackModule(CallbackBase):
             self.last_skipped = False
             msg = to_text(result._result.get('msg', '')) or\
                 to_text(result._result.get('reason', ''))
+
+            stderr = [result._result.get('exception', None),
+                      result._result.get('module_stderr', None)]
+            stderr = "\n".join([e for e in stderr if e]).strip()
+
             self._print_host_or_item(result._host,
                                      result._result.get('changed', False),
                                      msg,
@@ -190,11 +195,15 @@ class CallbackModule(CallbackBase):
                                      is_host=True,
                                      error=failed or unreachable,
                                      stdout=result._result.get('module_stdout', None),
-                                     stderr=result._result.get('exception', None),
+                                     stderr=stderr.strip(),
                                      )
             if 'results' in result._result:
                 for r in result._result['results']:
                     failed = 'failed' in r
+
+                    stderr = [r.get('exception', None), r.get('module_stderr', None)]
+                    stderr = "\n".join([e for e in stderr if e]).strip()
+
                     self._print_host_or_item(r['item'],
                                              r.get('changed', False),
                                              to_text(r.get('msg', '')),
@@ -202,7 +211,7 @@ class CallbackModule(CallbackBase):
                                              is_host=False,
                                              error=failed,
                                              stdout=r.get('module_stdout', None),
-                                             stderr=r.get('exception', None),
+                                             stderr=stderr.strip(),
                                              )
         else:
             self.last_skipped = True