Fix issue when install single apk

app/src/main/java/com/aurora/store/data/installer/AMInstaller.kt

@@ -28,9 +28,19 @@ class AMInstaller(context: Context) : InstallerBase(context) {
                     }
                 }
             }
+            when {
+                fileList.size == 1 -> {
+                    xInstall(packageName, File(fileList.first()))
+                }
+                fileList.size > 1 -> {
                     val apks = zipFile(fileList)
                     xInstall(packageName, apks)
                 }
+                else -> {
+                    throw Exception("Invalid data, expecting non empty fileList")
+                }
+            }
+        }
     }
 
     private fun xInstall(packageName: String, file: File) {