Merge pull request #238 from Unity-Technologies/UNI-32157-fix-empty-vendor-location-folder-error

Uni 32157 fix empty vendor location folder error

Author: vkovec

Assets/FbxExporters/Editor/FbxExportSettings.cs

@@ -178,13 +178,15 @@ public override void OnInspectorGUI() {
 
             EditorGUILayout.Space();
 
-
+            // disable button if no 3D application is available
+            EditorGUI.BeginDisabledGroup (!ExportSettings.CanInstall());
             var installIntegrationContent = new GUIContent(
                     "Install Unity Integration",
                     "Install and configure the Unity integration for the selected 3D application so that you can import and export directly with this project.");
             if (GUILayout.Button (installIntegrationContent)) {
                 FbxExporters.Editor.IntegrationsUI.InstallDCCIntegration ();
             }
+            EditorGUI.EndDisabledGroup ();
 
             GUILayout.FlexibleSpace ();
             GUILayout.EndScrollView ();
@@ -599,9 +601,8 @@ public static GUIContent[] GetDCCOptions(){
                 instance.dccOptionNames = new List<string> ();
                 FindDCCInstalls ();
             }
-
-            // store the selected app
-            var prevSelection = instance.dccOptionPaths[instance.selectedDCCApp];
+            // store the selected app if any
+            string prevSelection = GetSelectedDCCPath();
 
             // remove options that no longer exist
             List<string> pathsToDelete = new List<string>();
@@ -724,12 +725,21 @@ public static bool IsEarlierThanMax2017(string AppName){
 
         public static string GetSelectedDCCPath()
         {
-            return (instance.dccOptionPaths.Count>0) ? instance.dccOptionPaths [instance.selectedDCCApp] : "";
+            return (instance.dccOptionPaths.Count>0 &&
+                instance.selectedDCCApp >= 0 &&
+                instance.selectedDCCApp < instance.dccOptionPaths.Count) ? instance.dccOptionPaths [instance.selectedDCCApp] : "";
         }
 
         public static string GetSelectedDCCName()
         {
-            return (instance.dccOptionPaths.Count>0) ? instance.dccOptionNames [instance.selectedDCCApp] : "";
+            return (instance.dccOptionNames.Count>0 &&
+                instance.selectedDCCApp >= 0 &&
+                instance.selectedDCCApp < instance.dccOptionNames.Count) ? instance.dccOptionNames [instance.selectedDCCApp] : "";
+        }
+
+        public static bool CanInstall()
+        {
+            return instance.dccOptionPaths.Count > 0;
         }
 
         /// <summary>