claim update: Allow newValue of 0

Author: addshore

lib/claim/update.js

@@ -45,7 +45,7 @@ export default async (params, config, API) => {
 
   if (rank) simplifiedClaim.rank = rank
 
-  if (newValue) {
+  if (newValue != null) {
     if (newValue.snaktype && newValue.snaktype !== 'value') {
       simplifiedClaim.snaktype = newValue.snaktype
       delete simplifiedClaim.value