fix(remove): don't throw error if listener does not exist

Author: FabienMotte

src/index.js

@@ -106,12 +106,10 @@ class Signal {
 
     const listenerId = this._getListernerIndex(cb, context)
 
-    if (listenerId === -1) {
-      throw new Error('Signal.remove() : Listener does not exist')
+    if (listenerId !== -1) {
+      this._listeners.splice(listenerId, 1)
     }
 
-    this._listeners.splice(listenerId, 1)
-
     return this
   }