Fixed #11025 - TableHeaderCheckbox is checked when the selection arra…

…y is empty

src/app/components/table/table.ts

@@ -4087,7 +4087,7 @@ export class TableHeaderCheckbox  {
             const val = this.dt.frozenValue ? [...this.dt.frozenValue, ...data] : data;
             const selectableVal = this.dt.rowSelectable ? val.filter((data, index) => this.dt.rowSelectable({ data, index })) : val;
 
-            return selectableVal && this.dt.selection && selectableVal.every(v => this.dt.selection.some(s => this.dt.equals(v, s)));
+            return ObjectUtils.isNotEmpty(selectableVal) && ObjectUtils.isNotEmpty(this.dt.selection) && selectableVal.every(v => this.dt.selection.some(s => this.dt.equals(v, s)));
         }
     }
 }

src/app/components/utils/objectutils.ts

@@ -171,5 +171,17 @@ export class ObjectUtils {
         }
 
         return str;
-      }
+    }
+
+    public static isEmpty(value) {
+        return (
+            value === null || value === undefined || value === '' ||
+            (Array.isArray(value) && value.length === 0) ||
+            (!(value instanceof Date) && typeof value === 'object' && Object.keys(value).length === 0)
+        );
+    }
+
+    public static isNotEmpty(value) {
+        return !this.isEmpty(value);
+    }
 }