Corrected external add document issue.

tests/document_test.rs

@@ -0,0 +1,10 @@
+use morethantext::{action::*, MoreThanText, TestMoreThanText};
+use uuid::Uuid;
+
+#[test]
+fn is_document_created() {
+    let mut mtt = MoreThanText::new();
+    let doc_name = TestMoreThanText::random_name();
+    let docdef = DocDef::new(doc_name.clone());
+    mtt.create_document(docdef).unwrap();
+}