Clean up block audit page & tweak color scheme

backend/src/api/mining/mining-routes.ts

@@ -238,6 +238,12 @@ class MiningRoutes {
   public async $getBlockAudit(req: Request, res: Response) {
     try {
       const audit = await BlocksAuditsRepository.$getBlockAudit(req.params.hash);
+
+      if (!audit) {
+        res.status(404).send(`This block has not been audited.`);
+        return;
+      }
+
       res.header('Pragma', 'public');
       res.header('Cache-control', 'public');
       res.setHeader('Expires', new Date(Date.now() + 1000 * 3600 * 24).toUTCString());

backend/src/api/websocket-handler.ts

@@ -413,7 +413,7 @@ class WebsocketHandler {
 
     let mBlocks: undefined | MempoolBlock[];
     let mBlockDeltas: undefined | MempoolBlockDelta[];
-    let matchRate = 0;
+    let matchRate;
     const _memPool = memPool.getMempool();
 
     if (Common.indexingEnabled()) {

backend/src/repositories/BlocksAuditsRepository.ts

@@ -58,10 +58,12 @@ class BlocksAuditRepositories {
         WHERE blocks_audits.hash = "${hash}"
       `);
       
-      rows[0].missingTxs = JSON.parse(rows[0].missingTxs);
-      rows[0].addedTxs = JSON.parse(rows[0].addedTxs);
-      rows[0].transactions = JSON.parse(rows[0].transactions);
-      rows[0].template = JSON.parse(rows[0].template);
+      if (rows.length) {
+        rows[0].missingTxs = JSON.parse(rows[0].missingTxs);
+        rows[0].addedTxs = JSON.parse(rows[0].addedTxs);
+        rows[0].transactions = JSON.parse(rows[0].transactions);
+        rows[0].template = JSON.parse(rows[0].template);
+      }
             
       return rows[0];
     } catch (e: any) {