Part attachment comment field is required

InvenTree/part/migrations/0027_auto_20190518_1620.py

@@ -0,0 +1,18 @@
+# Generated by Django 2.2 on 2019-05-18 06:20
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('part', '0026_remove_supplierpart_single_price'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='partattachment',
+            name='comment',
+            field=models.CharField(help_text='File comment', max_length=100),
+        ),
+    ]

InvenTree/part/models.py

@@ -644,7 +644,7 @@ class PartAttachment(models.Model):
     attachment = models.FileField(upload_to=attach_file, null=True, blank=True,
                                   help_text='Select file to attach')
 
-    comment = models.CharField(max_length=100, blank=True, help_text='File comment')
+    comment = models.CharField(max_length=100, help_text='File comment')
 
     @property
     def basename(self):