Merge branch 'error-handling' into 'main'

fix: improve warning messages

See merge request flarenetwork/protocol-team/ftso-v2-example-value-provider!10

src/data-feeds/ccxt-provider-service.ts

@@ -200,9 +200,13 @@ export class CcxtFeed implements BaseDataFeed {
 
     // If no valid prices were found, return undefined
     if (prices.length === 0) {
-      this.logger.warn(`Unable to calculate median for ${JSON.stringify(feedId)}`);
+      this.logger.warn(`No prices found for ${JSON.stringify(feedId)}`);
       return undefined;
     }
+    // If single price found, return price
+    if (prices.length === 1) {
+      return prices[0];
+    }
 
     // Sort the prices in ascending order
     prices.sort((a, b) => a - b);