chore: removed leftover code

unified_planning/model/action.py

@@ -369,52 +369,9 @@ def is_conditional(self) -> bool:
     def clear_continuous_effects(self):
         self._continuous_effects = {}
 
-    def _add_continuous_effect(
-        self,
-        fluent: Union["up.model.fnode.FNode", "up.model.fluent.Fluent"],
-        value: "up.model.expression.Expression",
-        negative: bool,
-    ):
-
-        (
-            fluent_exp,
-            value_exp,
-            condition_exp,
-        ) = self._environment.expression_manager.auto_promote(
-            fluent,
-            value,
-            True,
-        )
-        if not fluent_exp.is_fluent_exp() and not fluent_exp.is_dot():
-            raise UPUsageError(
-                "fluent field of add_increase_effect must be a Fluent or a FluentExp or a Dot."
-            )
-        if not fluent_exp.type.is_compatible(value_exp.type):
-            raise UPTypeError(
-                f"Process effect has an incompatible value type. Fluent type: {fluent_exp.type} // Value type: {value_exp.type}"
-            )
-        if not fluent_exp.type.is_int_type() and not fluent_exp.type.is_real_type():
-            raise UPTypeError("Derivative can be created only on numeric types!")
-        e_kind = up.model.effect.EffectKind.CONTINUOUS_INCREASE
-
-        if negative:
-            e_kind = up.model.effect.EffectKind.CONTINUOUS_DECREASE
-        self._add_effect_instance(
-            StartTiming(),
-            up.model.effect.Effect(
-                fluent_exp,
-                value_exp,
-                condition_exp,
-                kind=e_kind,
-                forall=tuple(),
-            ),
-        )
-
     def has_continuous_effects(self):
-        for t, el in self._continuous_effects.items():
-            for e in el:
-                if e.is_continuous_increase() or e.is_continuous_decrease():
-                    return True
+        if len(self._continuous_effects) > 0:
+            return True
         return False
 
     def add_increase_continuous_effect(