Use default accepting, non-exception throwing, version of Environment::get

Source/ToolCore/NETTools/NETBuildSystem.cpp

@@ -283,7 +283,7 @@ namespace ToolCore
 
 #ifdef ATOMIC_PLATFORM_WINDOWS
 
-            String cmdToolsPath = Poco::Environment::get("VS140COMNTOOLS").c_str();
+            String cmdToolsPath = Poco::Environment::get("VS140COMNTOOLS", "").c_str();
 
             if (!cmdToolsPath.Length())
             {

Source/ToolCore/NETTools/NETProjectSystem.cpp

@@ -425,7 +425,7 @@ namespace ToolCore
         FileSystem* fileSystem = GetSubsystem<FileSystem>();
 
         // Query for Visual Studio 2015 path
-        idePath_ = Poco::Environment::get("VS140COMNTOOLS").c_str();
+        idePath_ = Poco::Environment::get("VS140COMNTOOLS", "").c_str();
 
         if (idePath_.Length())
         {