extend std::exception logging in txdb.cpp

src/txdb.cpp

@@ -148,7 +148,7 @@ bool CCoinsViewDB::GetStats(CCoinsStats &stats) {
             }
             pcursor->Next();
         } catch (std::exception &e) {
-            return error("%s() : deserialize error", __PRETTY_FUNCTION__);
+            return error("%s : Deserialize or I/O error - %s", __PRETTY_FUNCTION__, e.what());
         }
     }
     delete pcursor;
@@ -226,7 +226,7 @@ bool CBlockTreeDB::LoadBlockIndexGuts()
                 break; // if shutdown requested or finished loading block index
             }
         } catch (std::exception &e) {
-            return error("%s() : deserialize error", __PRETTY_FUNCTION__);
+            return error("%s : Deserialize or I/O error - %s", __PRETTY_FUNCTION__, e.what());
         }
     }
     delete pcursor;