Merge pull request #1729 from codablock/backport_bitcoin_11529

Backport bitcoin #11529: Avoid slow transaction search with txindex enabled (João Barbosa)

src/validation.cpp

@@ -1112,6 +1112,9 @@ bool GetTransaction(const uint256 &hash, CTransaction &txOut, const Consensus::P
                 return error("%s: txid mismatch", __func__);
             return true;
         }
+
+        // transaction not found in index, nothing more can be done
+        return false;
     }
 
     if (fAllowSlow) { // use coin database to locate block that contains transaction, and scan it