Fix a stack trace with ipmi_dumphashes when no database was configured.

HD Moore · HD Moore · commit afa442ad8930 · 2015-06-29T00:46:35.000-05:00
diff --git a/modules/auxiliary/scanner/ipmi/ipmi_dumphashes.rb b/modules/auxiliary/scanner/ipmi/ipmi_dumphashes.rb
@@ -270,7 +270,7 @@ def report_hash(user, hash)
     }.merge(service_data)
 
     cl = create_credential_login(login_data)
-    cl.core_id
+    cl ? cl.core_id : nil
   end
 
   def report_cracked_cred(user, password, core_id)
