add copy/paste in pollutant BC + debug

src/Model/Pollutants/Pollutants.py

@@ -45,7 +45,10 @@ class Pollutants(SQLSubModel):
         else:
             self.id = id
 
-        self._name = str(name)
+        if name is None or name == "":
+            self.name = f"pol{self.id}"
+        else:
+            self._name = str(name)
         self._enabled = True
 
         self._data = []