add fix for other formatters

Author: Artem

redisinsight/api/src/common/transformers/redis-reply/strategies/ascii-formatter.strategy.ts

@@ -30,8 +30,13 @@ export class ASCIIFormatterStrategy implements IFormatterStrategy {
     return result;
   }
 
-  private formatRedisObjectReply(reply: Object): object {
+  private formatRedisObjectReply(reply: Object): object | string {
     const result = {};
+
+    if (reply instanceof Error) {
+      return reply.toString();
+    }
+
     Object.keys(reply).forEach((key) => {
       result[key] = this.format(reply[key]);
     });

redisinsight/api/src/common/transformers/redis-reply/strategies/utf8-formatter.strategy.ts

@@ -30,8 +30,13 @@ export class UTF8FormatterStrategy implements IFormatterStrategy {
     return result;
   }
 
-  private formatRedisObjectReply(reply: Object): object {
+  private formatRedisObjectReply(reply: Object): object | string {
     const result = {};
+
+    if (reply instanceof Error) {
+      return reply.toString();
+    }
+
     Object.keys(reply).forEach((key) => {
       result[key] = this.format(reply[key]);
     });

redisinsight/api/src/modules/cli/services/cli-business/output-formatter/strategies/utf-8-formatter.strategy.ts

@@ -30,8 +30,13 @@ export class UTF8FormatterStrategy implements IOutputFormatterStrategy {
     return result;
   }
 
-  private formatRedisObjectReply(reply: Object): object {
+  private formatRedisObjectReply(reply: Object): object | string {
     const result = {};
+
+    if (reply instanceof Error) {
+      return reply.toString();
+    }
+
     Object.keys(reply).forEach((key) => {
       result[key] = this.format(reply[key]);
     });