Fix EvMenu infinite loop on empty-string key. Resolves #1769

evennia/utils/evmenu.py

@@ -458,7 +458,6 @@ class EvMenu(object):
         for key, val in kwargs.items():
             setattr(self, key, val)
 
-        #
         if self.caller.ndb._menutree:
             # an evmenu already exists - we try to close it cleanly. Note that this will
             # not fire the previous menu's end node.
@@ -992,8 +991,7 @@ class EvMenu(object):
         table_width_max = -1
         table = []
         for key, desc in optionlist:
-            if not (key or desc):
-                continue
+            if key or desc:
                 desc_string = ": %s" % desc if desc else ""
                 table_width_max = max(table_width_max,
                                       max(m_len(p) for p in key.split("\n")) +
@@ -1008,6 +1006,10 @@ class EvMenu(object):
 
         ncols = (_MAX_TEXT_WIDTH // table_width_max) + 1  # number of ncols
 
+        if ncols <= 0:
+            # no visible option at all
+            return ""
+
         # get the amount of rows needed (start with 4 rows)
         nrows = 4
         while nrows * ncols < nlist: