blockstream/electrs build fix for debian unstable

git.diff

diff --git a/Cargo.toml b/Cargo.toml
index 7b8ec56..bbaa386 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -39,8 +39,8 @@ num_cpus = "1.12.0"
 page_size = "0.4.2"
 prometheus = "0.13"
 rayon = "1.5.0"
-rocksdb = { version = "0.17.0", optional = true }
-rocksdb-oldcpu = { version = "0.12.4", optional = true, package = "rocksdb" }
+rocksdb = { version = "0.21.0", optional = true }
+rocksdb-oldcpu = { version = "0.21.0", optional = true, package = "rocksdb" }
 rust-crypto = "0.2"
 serde = "1.0.118"
 serde_derive = "1.0.118"
diff --git a/src/new_index/db.rs b/src/new_index/db.rs
index ef226d3..f5814f2 100644
--- a/src/new_index/db.rs
+++ b/src/new_index/db.rs
@@ -26,7 +26,7 @@ impl<'a> Iterator for ScanIterator<'a> {
         if self.done {
             return None;
         }
-        let (key, value) = self.iter.next()?;
+        let (key, value) = self.iter.next()?.ok()?;
         if !key.starts_with(&self.prefix) {
             self.done = true;
             return None;