astrodatagui: only set bin size none if text is none

main/astrodatagui/AstrodataGUI.py

@@ -285,8 +285,12 @@ class AstrodataGUI(QtWidgets.QMainWindow):
         try:
             binSize = float(self.edBinSize.text())
         except:
-            print(f"Invalid bin size detected: {self.edBinSize.text()}, setting None")
+            if(self.edBinSize.text().lower() == "none"):
                 binSize = None
+            else:
+                print(f"Invalid bin size detected: {self.edBinSize.text()}, aborting")
+                return
+
         self.flaredetectorPreview.setBinState(binEnabled, binSize)
 
     def updateFlaredetectionWidgetFlatten(self):