Remove manual model addition

src/zfitwrapper/BaseModel.py

@@ -25,23 +25,6 @@ class BaseModel(ABC):
         self._model = None  # type: Optional[zfit.core.basepdf.BasePDF]
         self._ext_model = None  # type: Optional[Union[Union[zfit.core.basepdf.BasePDF,zfit.core.interfaces.ZfitPDF] , Fitparameter]]
 
-    def __add__(self, model: "BaseModel") -> "BaseModel":
-        assert self.obs == model.obs, Exception(
-            f"[BaseModel]: obs cannot be matched! Given:\nself.obs: {self.obs}\nother.obs: {model.obs}"
-        )
-
-        zfit.settings.changed_warnings.new_sum = False
-        tmp = self.__class__(self.obs)
-        tmp._parameters = dict(self.parameters, **model.parameters)
-        if self.model is not None and model.model is not None:
-            tmp._model = zfit.pdf.SumPDF([self.model, model.model], fracs=[1, 1])
-        if isinstance(self.ext_model, zfit.core.interfaces.ZfitPDF) and isinstance(
-            model.ext_model, zfit.core.interfaces.ZfitPDF
-        ):
-            tmp._ext_model = zfit.pdf.SumPDF([self.ext_model, model.ext_model])
-
-        return tmp
-
     def __str__(self) -> str:
         string = "Model Wrapper"
         string += f"\nParameters:\n{self.parameters}"