Fix/Handle execution for no initial/entry step [#4]

Merge pull request #4 from TanmoySG/fix-no-initial-step

In v0.1-beta if there are no steps (no initial or subsequent steps) then the Execute() functions panics and exits. To Fix this adding a simple check to see if (initial) steps are not empty. If it is then no error is returned or no panics are caused.

if len(steps) == 0 {
	return nil, nil
}

go-steps.go

@@ -45,6 +45,11 @@ func (steps Steps) Execute(initArgs ...any) ([]interface{}, error) {
 	var stepOutput []interface{}
 	var stepError error
 
+	// no entry or initial step
+	if len(steps) == 0 {
+		return nil, nil
+	}
+
 	// entry step
 	var isEntryStep bool = true
 	step := steps[0]