fix CR issues

apps/block_scout_web/assets/js/lib/market_history_chart.js

@@ -129,6 +129,9 @@ class MarketHistoryChart {
 export function createMarketHistoryChart (el) {
   const dataPath = el.dataset.market_history_chart_path
   const $chartLoading = $('[data-chart-loading-message]')
+
+  $chartLoading.removeAttr('hidden')
+
   const $chartError = $('[data-chart-error-message]')
   const chart = new MarketHistoryChart(el, 0, [])
   $.getJSON(dataPath, {type: 'JSON'})
@@ -148,7 +151,6 @@ export function createMarketHistoryChart (el) {
 }
 
 $('[data-chart-error-message]').on('click', _event => {
-  $('[data-chart-loading-message]').removeAttr('hidden')
   $('[data-chart-loading-message]').show()
   $('[data-chart-error-message]').hide()
   createMarketHistoryChart($('[data-chart="marketHistoryChart"]')[0])

apps/block_scout_web/assets/js/pages/chain.js

@@ -210,7 +210,7 @@ const elements = {
   },
   '[data-selector="chain-block-list"] [data-selector="loading-message"]': {
     render ($el, state, oldState) {
-      if (state.blocksLoading) {
+      if (state && state.blocksLoading) {
         setTimeout(function () {
           $el.removeAttr('hidden')
           $el.show()
@@ -227,7 +227,7 @@ const elements = {
   },
   '[data-selector="transactions-list"] [data-selector="loading-message"]': {
     render ($el, state, oldState) {
-      if (state.transactionsLoading) {
+      if (state && state.transactionsLoading) {
         setTimeout(function () {
           $el.removeAttr('hidden')
           $el.show()