When reindexing check for file before trying to open (refactored)

src/init.cpp

@@ -401,9 +401,11 @@ void ThreadImport(std::vector<boost::filesystem::path> vImportFiles)
         int nFile = 0;
         while (true) {
             CDiskBlockPos pos(nFile, 0);
+            if (!boost::filesystem::exists(GetBlockPosFilename(pos, "blk")))
+                break; // No block files left to reindex
             FILE *file = OpenBlockFile(pos, true);
             if (!file)
-                break;
+                break; // This error is logged in OpenBlockFile
             LogPrintf("Reindexing block file blk%05u.dat...\n", (unsigned int)nFile);
             LoadExternalBlockFile(file, &pos);
             nFile++;