fix bug when multiple elines are to be ignored.

prospect/models/sedmodel.py

@@ -414,7 +414,7 @@ def parse_elines(self):
 
         self._fix_eline = ~self._fit_eline
 
-        if np.any(self.params.get("elines_to_ignore", [])):
+        if "elines_to_ignore" in self.params:
             assert np.all(np.isin(self.params["elines_to_ignore"], self.emline_info["name"])), f"Some ignored lines lines ({self.params['elines_to_ignore']}) are not in the cloudy grid; see $SPS_HOME/data/emlines_info.dat for accepted names"
 
             self._use_eline = ~np.isin(self.emline_info["name"],