fix(datepicker): fix scenario when inputs have no label

Author: didimmova

projects/igniteui-angular/src/lib/core/styles/components/date-range-picker/_date-range-picker-theme.scss

@@ -48,6 +48,10 @@
 
             &.input-has-hint {
                 align-self: center;
+
+                &:not(.input-has-label) {
+                    align-self: flex-start;
+                }
             }
         } @else {
             align-self: flex-start;

projects/igniteui-angular/src/lib/date-range-picker/date-range-picker.component.ts

@@ -541,6 +541,7 @@ export class IgxDateRangePickerComponent extends PickerBaseDirective
     /** @hidden @internal */
     public get separatorClass(): string {
         const classes = ['igx-date-range-picker__label'];
+        if (this.label) classes.push('input-has-label');
         if (this.hint) classes.push('input-has-hint');
         return classes.join(' ');
     }