fix(api): _render safe to false when there is inverted section (#…

…1042)

keep/iohandler/iohandler.py

@@ -252,10 +252,16 @@ def _parse(self, tree):
                 tree = ast.parse(token.encode("unicode_escape"))
         return _parse(self, tree)
 
-    def _render(self, key, safe=False, default=""):
+    def _render(self, key: str, safe=False, default=""):
         # change [] to . for the key because thats what chevron uses
         _key = key.replace("[", ".").replace("]", "")
 
+        if "{{^" in key or "{{ ^" in key:
+            self.logger.debug(
+                "Safe render is not supported when there are inverted sections."
+            )
+            safe = False
+
         context = self.context_manager.get_full_context()
         # TODO: protect from multithreaded where another thread will print to stderr, but thats a very rare case and we shouldn't care much
         original_stderr = sys.stderr