check OSError from gtkspell.py. Fixes #4897

src/chat_control.py

@@ -314,7 +314,7 @@ class ChatControlBase(MessageControl):
 			if lang:
 				self.msg_textview.lang = lang
 				spell.set_language(lang)
-		except (gobject.GError, RuntimeError, TypeError):
+		except (gobject.GError, RuntimeError, TypeError, OSError):
 			dialogs.AspellDictError(lang)
 
 	def on_msg_textview_populate_popup(self, textview, menu):

src/config.py

@@ -636,7 +636,7 @@ class PreferencesWindow:
 			if isinstance(ctrl, chat_control.ChatControlBase):
 				try:
 					spell_obj = gtkspell.get_from_text_view(ctrl.msg_textview)
-				except (TypeError, RuntimeError):
+				except (TypeError, RuntimeError, OSError):
 					spell_obj = None
 
 				if not spell_obj:
@@ -663,7 +663,7 @@ class PreferencesWindow:
 			tv = gtk.TextView()
 			try:
 				gtkspell.Spell(tv, lang)
-			except (TypeError, RuntimeError):
+			except (TypeError, RuntimeError, OSError):
 				dialogs.ErrorDialog(
 					_('Dictionary for lang %s not available') % lang,
 					_('You have to install %s dictionary to use spellchecking, or '

src/dialogs.py

@@ -2203,7 +2203,7 @@ class SingleMessageWindow:
 					lang = gajim.LANG
 				gtkspell.Spell(self.conversation_textview.tv, lang)
 				gtkspell.Spell(self.message_textview, lang)
-			except (gobject.GError, TypeError, RuntimeError):
+			except (gobject.GError, TypeError, RuntimeError, OSError):
 				AspellDictError(lang)
 
 		self.prepare_widgets_for(self.action)

src/gajim.py

@@ -3409,7 +3409,7 @@ class Interface:
 			try:
 				import gtkspell
 				spell = gtkspell.Spell(tv, lang)
-			except (ImportError, TypeError, RuntimeError):
+			except (ImportError, TypeError, RuntimeError, OSError):
 				dialogs.AspellDictError(lang)
 
 		if gajim.config.get('soundplayer') == '':