astrodatagui: fix crash if no distance found

main/astrodatagui/AstrodataGUI.py

@@ -2,6 +2,7 @@ from PyQt5 import QtWidgets, uic
 import os
 
 from astroquery.simbad import Simbad
+import numpy as np
 
 from .db.StarsDB import StarDB
 from .ui.NewStarDialog import NewStarDialog
@@ -100,7 +101,9 @@ class AstrodataGUI(QtWidgets.QMainWindow):
             print("No radial velocity found")
 
         try:
-            dist = result["Distance_distance"][0]
+            dist = float(result["Distance_distance"][0])
+            if(np.isnan(dist)):
+                dist = -1
             distUnit = result["Distance_unit"][0]
         except:
             dist = -1