ghidra: fix IndexError exception (#1879)

* ghidra: fix IndexError exception

scripts/capa2yara.py

@@ -61,7 +61,22 @@ var_names = ["".join(letters) for letters in itertools.product(string.ascii_lowe
 
 
 # this have to be the internal names used by capa.py which are sometimes different to the ones written out in the rules, e.g. "2 or more" is "Some", count is Range
-unsupported = ["characteristic", "mnemonic", "offset", "subscope", "Range", "os", "property", "format", "class", "operand[0].number", "operand[1].number", "substring", "arch", "namespace"]
+unsupported = [
+    "characteristic",
+    "mnemonic",
+    "offset",
+    "subscope",
+    "Range",
+    "os",
+    "property",
+    "format",
+    "class",
+    "operand[0].number",
+    "operand[1].number",
+    "substring",
+    "arch",
+    "namespace",
+]
 # further idea: shorten this list, possible stuff:
 # - 2 or more strings: e.g.
 # -- https://github.com/mandiant/capa-rules/blob/master/collection/file-managers/gather-direct-ftp-information.yml