Fix null url crash

app/src/main/kotlin/org/koitharu/kotatsu/browser/BrowserActivity.kt

@@ -14,6 +14,7 @@ import androidx.core.view.isVisible
 import androidx.core.view.updatePadding
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.ui.BaseActivity
+import org.koitharu.kotatsu.core.util.ext.toUriOrNull
 import org.koitharu.kotatsu.databinding.ActivityBrowserBinding
 import org.koitharu.kotatsu.parsers.network.UserAgents
 import com.google.android.material.R as materialR
@@ -80,12 +81,15 @@ class BrowserActivity : BaseActivity<ActivityBrowserBinding>(), BrowserCallback
 		}
 
 		R.id.action_browser -> {
+			val url = viewBinding.webView.url?.toUriOrNull()
+			if (url != null) {
 				val intent = Intent(Intent.ACTION_VIEW)
-			intent.data = Uri.parse(viewBinding.webView.url)
+				intent.data = url
 				try {
 					startActivity(Intent.createChooser(intent, item.title))
 				} catch (_: ActivityNotFoundException) {
 				}
+			}
 			true
 		}