Depsgraph: Ignore text datablocks from nodes

Those are not part of dependency graph, but still could be referenced from
the tree.

source/blender/depsgraph/intern/builder/deg_builder_nodes.cc

@@ -984,6 +984,9 @@ void DepsgraphNodeBuilder::build_nodetree(bNodeTree *ntree)
 			 * pipeline. No need to build dependencies for them here.
 			 */
 		}
+		else if (id_type == ID_TXT) {
+			/* Ignore script nodes. */
+		}
 		else if (bnode->type == NODE_GROUP) {
 			bNodeTree *group_ntree = (bNodeTree *)id;
 			if ((group_ntree->id.tag & LIB_TAG_DOIT) == 0) {