Fix improper use of operator "is" when comparing to literal values

gui/characterEditor.py

@@ -839,7 +839,7 @@ class APIView(wx.Panel):
 
     def getActiveCharacter(self):
         selection = self.charChoice.GetCurrentSelection()
-        return self.charChoice.GetClientData(selection) if selection is not -1 else None
+        return self.charChoice.GetClientData(selection) if selection != -1 else None
 
     def ssoListChanged(self, event):
         if not self:  # todo: fix event not unbinding properly

gui/characterSelection.py

@@ -122,7 +122,7 @@ class CharacterSelection(wx.Panel):
 
     def getActiveCharacter(self):
         selection = self.charChoice.GetCurrentSelection()
-        return self.charChoice.GetClientData(selection) if selection is not -1 else None
+        return self.charChoice.GetClientData(selection) if selection != -1 else None
 
     def refreshCharacterList(self, event=None):
         choice = self.charChoice

gui/mainFrame.py

@@ -254,7 +254,7 @@ class MainFrame(wx.Frame):
             except:
                 fits.remove(id)
 
-        if not self.prevOpenFits['enabled'] or len(fits) is 0:
+        if not self.prevOpenFits['enabled'] or len(fits) == 0:
             # add blank page if there are no fits to be loaded
             self.fitMultiSwitch.AddPage()
             return