Fix crash for [/attack] without [attack]. Fixes #2052

data/tools/wesnoth/wmltools3.py

@@ -785,6 +785,7 @@ def __init__(self, dirpath=[], exclude="", warnlevel=0, progress=False):
                                     self.missing.append((name, Reference(ns,fn,n+1)))
                         # Notice implicit references through attacks
                         if state == "outside":
+                            have_icon = False
                             if "[attack]" in line:
                                 beneath = 0
                                 attack_name = default_icon = None