Fix patch not present in database

patch_detector/index.ts

@@ -41,9 +41,13 @@ async function compareLatestSavedPatch(client: MongoClient, newPatch : string, n
     const patches = database.collection("patches")
     const latestPatch = await patches.find().limit(1).sort({date:-1}).next()
     
+    if(latestPatch == null) {
+        console.log("No previous patch recorded in database.")
+    } else {
         console.log("Latest patch in database is: " + latestPatch.patch)
+    }
     
-    if(latestPatch.patch != newPatch) {
+    if(latestPatch == null || latestPatch.patch != newPatch) {
         await patches.insertOne({patch:newPatch, date:newDate})
         return false
     }