SL: Add default name.

src/Model/SedimentLayer/SedimentLayer.py

@@ -37,6 +37,9 @@ class Layer(SQLSubModel):
 
     @property
     def name(self):
+        if self._name == "":
+            return f"SL{self.id + 1}"
+
         return self._name
 
     @name.setter