[TSVB] Wrong x-axis formatting if "dateFormat" configuration property…

… is not specified (elastic#84899)

* [TSVB] Wrong x-axis formatting if "dateFormat" configuration property is not specified

* Update create_xaxis_formatter.js

Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>
# Conflicts:
#	src/plugins/vis_type_timeseries/public/application/components/vis_types/timeseries/vis.js

src/plugins/vis_type_timeseries/public/application/components/lib/create_xaxis_formatter.js

@@ -18,18 +18,18 @@
  */
 
 import moment from 'moment';
-export function getFormat(interval, rules, dateFormat) {
+
+function getFormat(interval, rules = []) {
   for (let i = rules.length - 1; i >= 0; i--) {
     const rule = rules[i];
     if (!rule[0] || interval >= moment.duration(rule[0])) {
       return rule[1];
     }
   }
-  return dateFormat;
 }
 
 export function createXaxisFormatter(interval, rules, dateFormat) {
   return (val) => {
-    return moment(val).format(getFormat(interval, rules, dateFormat));
+    return moment(val).format(getFormat(interval, rules) ?? dateFormat);
   };
 }

src/plugins/vis_type_timeseries/public/application/components/vis_types/timeseries/vis.js

@@ -46,11 +46,6 @@ export class TimeseriesVisualization extends Component {
 
   xAxisFormatter = (interval) => (val) => {
     const { scaledDataFormat, dateFormat } = this.props.visData;
-
-    if (!scaledDataFormat || !dateFormat) {
-      return val;
-    }
-
     const formatter = createXaxisFormatter(interval, scaledDataFormat, dateFormat);
 
     return formatter(val);