Ignore assets with null market_cap_rank

Brand new assets added to coingecko are shoved into the middle of the list without a rank and should be ignored

Author: peachbits

src/coinrankEngine.ts

@@ -62,7 +62,8 @@ export const coinrankEngine = async (
 
         const reply = await response.json()
         const marketsPage = asCoingeckoMarkets(reply)
-        markets = [...markets, ...marketsPage]
+        // Filter out assets without a rank (newly listed assets may lack rankings)
+        markets = [...markets, ...marketsPage.filter(m => m.rank != null)]
         page++
         if (page > NUM_PAGES) break
       }

src/types.ts

@@ -35,7 +35,7 @@ const asCoingeckoAsset = (raw: any) => {
     image: asString,
     current_price: asOptional(asNumber),
     market_cap: asOptional(asNumber),
-    market_cap_rank: asNumber,
+    market_cap_rank: asOptional(asNumber),
 
     high_24h: asOptional(asNumber),
     low_24h: asOptional(asNumber),