### What problem does this PR solve?
As title
main fix:
```go
if _, ok := req["meta_data_filter"]; !ok || req["meta_data_filter"] == nil {
req["meta_data_filter"] = map[string]interface{}{}
}
```
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
- [x] Refactoring
445a13ee9a