fix: android release

Author: NathanWalker

package.json

@@ -1,6 +1,6 @@
 {
   "name": "nativescript-audio",
-  "version": "3.4.1",
+  "version": "3.4.2",
   "description": "NativeScript plugin to record and play audio.",
   "main": "audio",
   "typings": "index.d.ts",

src/android/recorder.ts

@@ -100,7 +100,9 @@ export class TNSRecorder implements TNSRecordI {
   public stop(): Promise<any> {
     return new Promise((resolve, reject) => {
       try {
-        this.recorder.stop();
+        if (this.recorder) {
+          this.recorder.stop();
+        }
         resolve();
       } catch (ex) {
         reject(ex);
@@ -111,7 +113,9 @@ export class TNSRecorder implements TNSRecordI {
   public dispose(): Promise<any> {
     return new Promise((resolve, reject) => {
       try {
-        this.recorder.release();
+        if (this.recorder) {
+          this.recorder.release();
+        }
         this.recorder = undefined;
         resolve();
       } catch (ex) {