convert: handle deleted files when converting from Perforce (issue4743)

hgext/convert/p4.py

@@ -164,7 +164,8 b' class p4_source(converter_source):'
                 raise IOError(d["generic"], data)
 
             elif code == "stat":
-                if d.get("action") == "purge":
+                action = d.get("action")
+                if action in ["purge", "delete", "move/delete"]:
                     return None, None
                 p4type = self.re_type.match(d["type"])
                 if p4type: