human
Solve the following python programming problem given the following code:
def declare_chain(name = '', action = '', ext_in = '', ext_out = '', reentrant = True, color = 'BLUE', install = 0, before = [], after = [], decider = None, rule = None, scan = None) : 
    '
\tsee Tools/flex.py for an example
\twhile i do not like such wrappers, some people really do
\t' 
    action = (action or color) 
    if isinstance (action, str) : 
        act = Task.simple_task_type (name, action, color = color) 
else : 
        act = Task.task_type_from_func (name, action, color = color) 
act.ext_in = tuple (Utils.to_list (ext_in)) 
    act.ext_out = tuple (Utils.to_list (ext_out)) 
    act.before = Utils.to_list (before) 
    act.after = Utils.to_list (after) 
    act.scan = scan 
    def x_file(self, node) : 
        if decider : 
            ext = decider (self, node) 
else : 
            ext = ext_out 
if isinstance (ext, str) : 
            out_source = node.change_ext (ext) 
            if reentrant : 
                self.allnodes.append (out_source) 
else : 
            if isinstance (ext, list) : 
                out_source = [node.change_ext (x) for x in ext] 
                if reentrant : 
                    for i in xrange ((((reentrant is True) and len (out_source)) or reentrant)) : 
                        self.allnodes.append (out_source [i]) 
else : 
                raise Utils.WafError (('do not know how to process %s' % str (ext))) 
tsk = self.create_task (name, node, out_source) 
        if node.__class__.bld.is_install : 
            tsk.install = install 
declare_extension (act.ext_in, x_file) 

    
    

    Fix the buggy line: action = (action or color)
assistant
#Here is Python program to fix the buggy line: action = (action or color)
.

action = (action or rule)