Add nil checks for boolean parameters in config helper (closes #2364) (#2380)

* Add nil checks for boolean parameters in config helper (closes #2364)

* remove some trailing spaces

scripts/configuration_helper.lua

@@ -1,8 +1,8 @@
 -- Helper functions that are useful to customize the openspace.cfg loading
 
--- ####################################################################################### 
+-- #######################################################################################
 -- ##                          Public functions                                         ##
--- ####################################################################################### 
+-- #######################################################################################
 
 -- SGCT related functions
 sgct = {}
@@ -79,9 +79,9 @@ sgctconfiginitializeString = ""
 
 
 --[[
-########################################################################################## 
+##########################################################################################
                             Internal helper functions
-########################################################################################## 
+##########################################################################################
 ]]--
 
 function generateSingleViewportFOV(down, up, left, right, tracked)
@@ -89,7 +89,7 @@ function generateSingleViewportFOV(down, up, left, right, tracked)
 
   table.insert(result,   [[            {]])
 
-  if tracked then
+  if tracked ~= nil then
     table.insert(result, [[              "tracked": ]] .. tostring(tracked) .. [[,]])
   end
 
@@ -114,7 +114,7 @@ function generateFisheyeViewport(fov, quality, tilt, background, crop, offset, t
 
   table.insert(result,   [[           {]])
 
-  if tracked then
+  if tracked ~= nil then
     table.insert(result, [[             "tracked": ]] .. tostring(tracked) .. [[,]])
   end
 
@@ -162,7 +162,7 @@ function generateWindow(result, fullScreen, msaa, border, monitor, tags, stereo,
                         size, res, viewport)
   table.insert(result,   [[          "name": "OpenSpace",]])
 
-  if fullScreen then
+  if fullScreen ~= nil then
     table.insert(result, [[          "fullscreen": ]] .. tostring(fullScreen) .. [[,]])
   end
 
@@ -170,7 +170,7 @@ function generateWindow(result, fullScreen, msaa, border, monitor, tags, stereo,
     table.insert(result, [[          "msaa": ]] .. msaa .. [[,]])
   end
 
-  if border then
+  if border ~= nil then
     table.insert(result, [[          "border": ]] .. tostring(border) .. [[,]])
   end
 
@@ -253,7 +253,7 @@ end
 function generateSettings(result, refreshRate, vsync)
   table.insert(result,   [[    "display": {]])
 
-  if (refreshRate) then
+  if refreshRate then
     table.insert(result, [[      "refreshrate": ]] .. refreshRate .. [[,]])
   end
 
@@ -275,7 +275,7 @@ function generateCluster(arg, viewport)
   table.insert(result,   [[  "version": 1,]])
   table.insert(result,   [[  "masteraddress": "127.0.0.1",]])
 
-  if arg["sgctDebug"] then
+  if arg["sgctDebug"] ~= nil then
     table.insert(result, [[  "debug": ]] .. tostring(arg["sgctdebug"]) .. [[,]])
   end
 
@@ -321,7 +321,7 @@ function check(type_str, arg, param, subparam_type)
         type(v) == subparam_type,
         param .. "[" .. k .. "] must be a " .. subparam_type
       )
-    end    
+    end
   end
 end
 
@@ -347,8 +347,8 @@ function generateSingleWindowConfig(arg, viewport)
     check("table", arg["scene"], "orientation", "number")
     check("number", arg["scene"], "scale")
   end
-  
-  if arg["shared"] then
+
+  if arg["shared"] ~= nil then
     local t = arg["tags"]
     t[#t + 1] = "Spout"
   end
@@ -420,9 +420,9 @@ function sgct.config.single(arg)
 
   arg["tracked"] = arg["tracked"] or true
 
-  local viewport = generateSingleViewportFOV(arg["fov"]["down"], arg["fov"]["up"], 
+  local viewport = generateSingleViewportFOV(arg["fov"]["down"], arg["fov"]["up"],
     arg["fov"]["left"], arg["fov"]["right"], arg["tracked"])
- 
+
   return sgct.makeConfig(generateSingleWindowConfig(arg, viewport))
 end
 
@@ -445,7 +445,7 @@ function sgct.config.fisheye(arg)
     -- OpenSpace code prior to loading this file
 
     local scale_factor = 2.0/3.0;
-    arg["size"] = { ScreenResolution.x * scale_factor, ScreenResolution.y * scale_factor }    
+    arg["size"] = { ScreenResolution.x * scale_factor, ScreenResolution.y * scale_factor }
   end
 
   check("number", arg, "fov")