SVY-19012 TiNG tabIndex is reverted if there is any other tab model

change

if the tabs are again send as changed (right after it is displayed)
and there is no selectedTab yet then don't try to set the selectedtab
because that could override the tabindex that is also coming.

The tab should only be reselected if there was one in the first place if
the tabs property is changed.

projects/bootstrapcomponents/src/bts_basetabpanel.ts

@@ -38,7 +38,7 @@ export class ServoyBootstrapBaseTabPanel<T extends HTMLElement> extends ServoyBo
 		if (changes['tabs']) {
 			// quickly generate the id's for a the tab html id (and selecting it)
 			this.generateIDs();
-            if (!changes['tabs'].firstChange) {
+            if (!changes['tabs'].firstChange && this.selectedTab) {
                 const index = this.getRealTabIndex();
                 if (index >= 0) {
                     this.select(this.tabs[index]);