fix(debug): only set session manager debug if it is defined

src/SASViyaApiClient.ts

@@ -52,8 +52,10 @@ export class SASViyaApiClient {
 
   public set debug(value: boolean) {
     this._debug = value
+    if (this.sessionManager) {
       this.sessionManager.debug = value
     }
+  }
 
   /**
    * Returns a list of jobs in the currently set root folder.