Use a space instead of a cross while checking features

src/tabs/basetabs.py

@@ -818,7 +818,7 @@ class OneToOneTab(ChatTab):
             self.__initial_disco = True
 
         ok = get_theme().CHAR_OK
-        nope = get_theme().CHAR_ERROR
+        nope = get_theme().CHAR_EMPTY
 
         correct = ok if correct else nope
         attention = ok if attention else nope

src/theming.py

@@ -303,6 +303,7 @@ class Theme(object):
     CHAR_NEW_TEXT_SEPARATOR = '- '
     CHAR_OK = '✔'
     CHAR_ERROR = '✖'
+    CHAR_EMPTY = ' '
     CHAR_ACK_RECEIVED = CHAR_OK
     CHAR_COLUMN_ASC = ' ▲'
     CHAR_COLUMN_DESC = ' ▼'