allow non-present build args

1 files changed, 7 insertions, 0 deletions

diff --git a/src/lua/mod.rs b/src/lua/mod.rs
index 26d2d5b..75b9cec 100644
--- a/src/lua/mod.rs
+++ b/src/lua/mod.rs
@@ -105,6 +105,13 @@ impl BuildEnv {
                         cwd,
                     }
                 },
+                LuaValue::Nil => {
+                    RunParams {
+                        step: None,
+                        name: None,
+                        cwd: None,
+                    }
+                }
                 other => {
                     return Err(LuaError::RuntimeError(format!("argument 2 was not a table: {:?}", other)));
                 }