FIX: Removed numpy dependency.

tests/test_issues_mysqlbackend.py

@@ -26,7 +26,6 @@
 import caosdb as db
 from nose import with_setup
 from nose.tools import assert_equal
-import numpy as np
 import pytest
 
 
@@ -71,4 +70,4 @@ def test_issue_18():
 
     C1 = db.Entity(name="C").retrieve()
     pids = [p.id for p in C1.parents]
-    assert_equal(np.unique(pids), len(pids), "Duplicate parents.")
+    assert_equal(len(set(pids)), len(pids), "Duplicate parents.")