From 0445fcda51cad08a0b2969140b48948a9e7d759b Mon Sep 17 00:00:00 2001
From: guerler <aysam.guerler@gmail.com>
Date: Fri, 4 Mar 2016 09:26:16 -0500
Subject: [PATCH] Add workflow building mode check to collection parameter
 handling

---
 lib/galaxy/tools/parameters/basic.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/galaxy/tools/parameters/basic.py b/lib/galaxy/tools/parameters/basic.py
index 3c74009bba4..6b61f02b8cc 100644
--- a/lib/galaxy/tools/parameters/basic.py
+++ b/lib/galaxy/tools/parameters/basic.py
@@ -2346,6 +2346,8 @@ class DataCollectionToolParameter( BaseDataToolParameter ):
         return field
 
     def from_html( self, value, trans, other_values={} ):
+        if trans.workflow_building_mode:
+            return None
         if not value and not self.optional:
             raise ValueError( "History does not include a dataset collection of the correct type or containing the correct types of datasets" )
         if value in [None, "None"]: