Don't fetch pehnotypes if ancestry already selected

client/pages/gwas.vue

@@ -91,6 +91,7 @@ export default {
   },
   methods: {
     selectAncestry(initTableName) {
+      if (this.selectedInitTable === initTableName) return
       this.selectedInitTable = initTableName
       this.$axios.$post('/phenotypes', { initTableName })
         .then(phenotypes => {