Add a helper function for checking if a package is installed.

app/src/main/java/com/etesync/syncadapter/utils/EventEmailInvitation.kt

@@ -19,15 +19,7 @@ import java.text.SimpleDateFormat
 import java.util.*
 
 fun emailSupportsAttachments(context: Context): Boolean {
-    var supportsAttachments = false
-
-    try {
-        context.packageManager.getPackageInfo("ch.protonmail.android", 0)
-    } catch (e: PackageManager.NameNotFoundException) {
-        supportsAttachments = true
-    }
-
-    return supportsAttachments
+    return !packageInstalled(context, "ch.protonmail.android")
 }
 
 class EventEmailInvitation constructor(val context: Context, val account: Account) {

app/src/main/java/com/etesync/syncadapter/utils/PackageManager.kt

@@ -0,0 +1,15 @@
+package com.etesync.syncadapter.utils
+
+import android.content.Context
+import android.content.pm.PackageManager
+
+
+fun packageInstalled(context: Context, packageName: String): Boolean {
+    try {
+        context.packageManager.getPackageInfo(packageName, 0)
+    } catch (e: PackageManager.NameNotFoundException) {
+        return false
+    }
+
+    return true
+}