Fixed lzmamod bug

src/binwalk/plugins/lzmamod.py

@@ -21,7 +21,7 @@ class LZMAModPlugin(binwalk.core.plugin.Plugin):
         # Note that this assumes that there is *one* LZMA extraction command...
         rules = self.module.extractor.get_rules()
         for i in range(0, len(rules)):
-            if rules[i]['regex'].match(self.SIGNATURE) and rules[i]['cmd']:
+            if rules[i]['regex'] and rules[i]['cmd'] and rules[i]['regex'].match(self.SIGNATURE):
                 self.original_cmd = rules[i]['cmd']
                 rules[i]['cmd'] = self.lzma_cable_extractor
                 break