try...catch on destroying PIXI app

the destroy method doesn't check if its stage has already been destroyed so it will throw if we try to destroy twice

Author: brianchirls

src/components/Export.js

@@ -513,7 +513,9 @@ const Def = class Export extends React.Component {
 			if (draw.destroy) {
 				draw.destroy();
 			}
-			app.destroy();
+			try {
+				app.destroy();
+			} catch (e) {}
 		}, mime);
 	}
 
@@ -729,7 +731,9 @@ const Def = class Export extends React.Component {
 			if (draw.destroy) {
 				draw.destroy();
 			}
-			app.destroy();
+			try {
+				app.destroy();
+			} catch (e) {}
 		};
 
 		me.frameId = requestIdleCallback(renderFrames);

src/components/Sketch.js

@@ -215,7 +215,9 @@ const Def = class Sketch extends React.Component {
 				view = this.pixiApp.renderer.view;
 				context = this.pixiApp.renderer.context;
 
-				this.pixiApp.destroy();
+				try {
+					this.pixiApp.destroy();
+				} catch (e) {}
 			}
 
 			const pixiOptions = assign({}, defaultPixiOptions, {
@@ -262,7 +264,9 @@ const Def = class Sketch extends React.Component {
 			if (context) {
 				contexts.push(context);
 			}
-			this.pixiApp.destroy();
+			try {
+				this.pixiApp.destroy();
+			} catch (e) {}
 			this.pixiApp = null;
 		}
 	}