Add backwards 'advanceto' compatibility to unit_tree tool.
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@ -300,6 +300,9 @@ class WesnothList:
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unit.advance = []
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advanceto = unit.get_text_val("advances_to")
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# Add backwards compatibility for 1.4
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if not advanceto:
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advanceto = unit.get_text_val("advanceto")
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if advanceto and advanceto != "null":
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for advance in advanceto.split(","):
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auid = advance.strip()
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