set string description for CellLine objects

Former-commit-id: 439a5ae1d63237da9601299acb377972a55cdb3e

ippisite/ippidb/models.py

@@ -298,6 +298,9 @@ class MDDRSimilarity(models.Model):
 class CellLine(models.Model):
     name = models.CharField('Name', max_length=50, unique=True)
 
+    def __str__(self):
+        return self.name
+
 class TestActivityDescription(models.Model):
     TEST_TYPES = (
         ('BIOCH', 'Biochemical assay'),