Allow intentionally swallowed errors in BlockBasedFilterBlockReader (#8695)

Summary:
To avoid getting "Didn't get expected error from Get" from
crash test by enabling block-based filter in crash test in https://github.com/facebook/rocksdb/issues/8679.
Basically, this applies the pattern of IGNORE_STATUS_IF_ERROR in
full_filter_block.cc to block_based_filter_block.cc

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8695

Test Plan: watch for resolution of crash test runs

Reviewed By: ltamasi

Differential Revision: D30496748

Pulled By: pdillinger

fbshipit-source-id: f7808fcf14c0e787fe81da03fa8303244590d273

table/block_based/block_based_filter_block.cc

@@ -257,6 +257,7 @@ bool BlockBasedFilterBlockReader::MayMatch(
   const Status s =
       GetOrReadFilterBlock(no_io, get_context, lookup_context, &filter_block);
   if (!s.ok()) {
+    IGNORE_STATUS_IF_ERROR(s);
     return true;
   }
 
@@ -315,6 +316,7 @@ std::string BlockBasedFilterBlockReader::ToString() const {
       GetOrReadFilterBlock(false /* no_io */, nullptr /* get_context */,
                            nullptr /* lookup_context */, &filter_block);
   if (!s.ok()) {
+    IGNORE_STATUS_IF_ERROR(s);
     return std::string("Unable to retrieve filter block");
   }