From 6140dd955ae5162f33459a4d90debf02246c8f0d Mon Sep 17 00:00:00 2001
From: Jeremy Stretch <jstretch@digitalocean.com>
Date: Tue, 6 Nov 2018 12:12:01 -0500
Subject: [PATCH] Set unit_length to empty string when not specified during
 cable import

---
 netbox/dcim/forms.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/netbox/dcim/forms.py b/netbox/dcim/forms.py
index 04e2120e6..8e0ab5a99 100644
--- a/netbox/dcim/forms.py
+++ b/netbox/dcim/forms.py
@@ -1969,6 +1969,11 @@ class CableCSVForm(forms.ModelForm):
         self.instance.termination_b = termination_object
         return termination_object
 
+    def clean_length_unit(self):
+        # Avoid trying to save as NULL
+        length_unit = self.cleaned_data.get('length_unit', None)
+        return length_unit if length_unit is not None else ''
+
 
 class CableBulkEditForm(BootstrapMixin, BulkEditForm):
     pk = forms.ModelMultipleChoiceField(