fix: error logging in firefox (#2768)

Firefox has an error type with a `.stack` property that is an empty
string, so guard on the various properties being empty before logging
them.

Author: achingbrain

packages/logger/src/index.ts

@@ -79,7 +79,7 @@ debug.formatters.a = (v?: Multiaddr): string => {
 
 // Add a formatter for stringifying Errors
 debug.formatters.e = (v?: Error): string => {
-  return v == null ? 'undefined' : v.stack ?? v.message
+  return v == null ? 'undefined' : notEmpty(v.stack) ?? notEmpty(v.message) ?? v.toString()
 }
 
 export interface Logger {
@@ -220,3 +220,17 @@ export function enable (namespaces: string): void {
 export function enabled (namespaces: string): boolean {
   return debug.enabled(namespaces)
 }
+
+function notEmpty (str?: string): string | undefined {
+  if (str == null) {
+    return
+  }
+
+  str = str.trim()
+
+  if (str.length === 0) {
+    return
+  }
+
+  return str
+}