Initialize loadTime to null in Atom environment constructor

src/atom.coffee

@@ -152,6 +152,7 @@ class Atom extends Model
   # Call .loadOrCreate instead
   constructor: (@state) ->
     {@mode} = @state
+    @loadTime = null
     {devMode, safeMode, resourcePath} = @getLoadSettings()
     configDirPath = @getConfigDirPath()
 
@@ -274,8 +275,6 @@ class Atom extends Model
 
     @setBodyPlatformClass()
 
-    @loadTime = null
-
     {devMode, safeMode, resourcePath} = @getLoadSettings()
     configDirPath = @getConfigDirPath()