Don't error out when newRef already exist, use it instead

Before this commit when a newRef was entered on user registration and
that ref already existed we errored out. Now we use exactly that
reference when it already exists.

contest/forms.py

@@ -27,8 +27,6 @@ class UpdateRefForm(forms.Form):
 
 	def clean_newRefName(self):
 		data = self.cleaned_data["newRefName"].strip().upper()
-		if Reference.objects.filter(name=data).count() > 0:
-			raise forms.ValidationError("Reference already exists")
 
 		return data
 
@@ -38,6 +36,14 @@ class UpdateRefForm(forms.Form):
 		existingRef = cleaned_data.get("existingRef")
 		newRefName = cleaned_data.get("newRefName")
 
+		if newRefName:
+			try:
+				ref = Reference.objects.get(name=newRefName)
+				self.cleaned_data['newRefName'] = None
+				self.cleaned_data['existingRef'] = ref
+			except Reference.DoesNotExist:
+				pass
+
 		if existingRef and newRefName:
 			raise forms.ValidationError("Select an existing exchange or create a new one, not both!")
 		if not existingRef and not newRefName: