check self._missing_bounds() instead of self.__missing_bounds

Author: basnijholt

adaptive/learner/learner1D.py

@@ -326,7 +326,7 @@ def npoints(self) -> int:
 
     @cache_latest
     def loss(self, real: bool = True) -> float:
-        if self.__missing_bounds:
+        if self._missing_bounds():
             return np.inf
         losses = self.losses if real else self.losses_combined
         if not losses: