chore(module:pipes): remove nzSafeNull pipe (#8777)

Author: HyperLife1119

components/pipes/demo/safe-null.md

@@ -23,12 +23,6 @@ import { NzPipesModule } from 'ng-zorro-antd/pipes';
 
 ## API
 
-### **nzSafeNull**:standalone
-
-| Property  | Description       | Type     | Default |
-| --------- | ----------------- | -------- | ------- |
-| `replace` | Replace character | `string` | ''      |
-
 ### **nzBytes**:standalone
 
 | Property  | Description                     | Type     | Default |

components/pipes/demo/safe-null.ts

@@ -23,12 +23,6 @@ import { NzPipesModule } from 'ng-zorro-antd/pipes';
 
 ## API
 
-### **nzSafeNull**:standalone
-
-| 参数      | 说明     | 类型     | 默认值 |
-| --------- | -------- | -------- | ------ |
-| `replace` | 替换字符 | `string` | ''     |
-
 ### **nzBytes**:standalone
 
 | 参数      | 说明               | 类型     | 默认值 |

components/pipes/doc/index.en-US.md

@@ -9,19 +9,10 @@ import { NzAggregatePipe } from './nz-aggregate.pipe';
 import { NzBytesPipe } from './nz-bytes.pipe';
 import { NzToCssUnitPipe } from './nz-css-unit.pipe';
 import { NzEllipsisPipe } from './nz-ellipsis.pipe';
-import { NzSafeNullPipe } from './nz-safe-null.pipe';
 import { NzSanitizerPipe } from './nz-sanitizer.pipe';
 import { NzTrimPipe } from './nz-trim.pipe';
 
-const pipes = [
-  NzToCssUnitPipe,
-  NzSafeNullPipe,
-  NzSanitizerPipe,
-  NzTrimPipe,
-  NzBytesPipe,
-  NzAggregatePipe,
-  NzEllipsisPipe
-];
+const pipes = [NzToCssUnitPipe, NzSanitizerPipe, NzTrimPipe, NzBytesPipe, NzAggregatePipe, NzEllipsisPipe];
 
 @NgModule({
   imports: [pipes],

components/pipes/doc/index.zh-CN.md

@@ -3,11 +3,10 @@
  * found in the LICENSE file at https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE
  */
 
-export * from './nz-pipes.module';
-export * from './nz-css-unit.pipe';
+export * from './nz-aggregate.pipe';
 export * from './nz-bytes.pipe';
+export * from './nz-css-unit.pipe';
 export * from './nz-ellipsis.pipe';
-export * from './nz-aggregate.pipe';
-export * from './nz-safe-null.pipe';
+export * from './nz-pipes.module';
 export * from './nz-sanitizer.pipe';
 export * from './nz-trim.pipe';