Removed databases with empty names.

src/morethantext/databases.rs

@@ -14,7 +14,7 @@ impl Databases {
     }
 
     fn add_database(&mut self, name: &str, id: &str) -> Option<String> {
-        if self.db_map.contains_key(name) {
+        if name.len() == 0 || self.db_map.contains_key(name) {
             None
         } else {
             self.db_map.insert(name.to_string(), id.to_string());
@@ -96,6 +96,15 @@ mod functions {
         assert_eq!(output, Some(id.to_string()));
     }
 
+    #[test]
+    fn add_entry_no_name() {
+        let name = "";
+        let id = "123456";
+        let mut dbs = Databases::new();
+        let output = dbs.add_database(name, id);
+        assert_eq!(output, None);
+    }
+
     #[test]
     fn entry_cannot_be_over_written() {
         let name = "barney";