fixing issue launching BIDS Helper VS2015 older versions

Author: furmangg

BidsHelperPackage.cs

@@ -276,8 +276,11 @@ private bool SwitchVsixManifest()
 
                     //it looks like some earlier versions of VS2015 use the registry while newer versions of VS2015 (like Update 3) just use the vsixmanifest and pkgdef files?
                     Microsoft.Win32.RegistryKey regKey = Microsoft.Win32.Registry.CurrentUser.OpenSubKey(@"Software\Microsoft\VisualStudio\14.0_Config\Packages\{" + PackageGuidString +"}", true);
-                    regKey.SetValue("CodeBase", sDll2016Path, Microsoft.Win32.RegistryValueKind.String);
-                    regKey.Close();
+                    if (regKey != null) 
+                    {
+                        regKey.SetValue("CodeBase", sDll2016Path, Microsoft.Win32.RegistryValueKind.String);
+                        regKey.Close();
+                    }
 
                     System.Windows.Forms.MessageBox.Show("You have SSDT for SQL Server " + VersionInfo.SqlServerFriendlyVersion + " installed. Please restart Visual Studio so BIDS Helper can reconfigure itself to work properly with that version of SSDT.", "BIDS Helper");
                     return true;
@@ -323,8 +326,11 @@ private bool SwitchVsixManifest()
 
                     //it looks like some earlier versions of VS2015 use the registry while newer versions of VS2015 (like Update 3) just use the vsixmanifest and pkgdef files?
                     Microsoft.Win32.RegistryKey regKey = Microsoft.Win32.Registry.CurrentUser.OpenSubKey(@"Software\Microsoft\VisualStudio\14.0_Config\Packages\{" + PackageGuidString +"}", true);
-                    regKey.SetValue("CodeBase", sDll2017Path, Microsoft.Win32.RegistryValueKind.String);
-                    regKey.Close();
+                    if (regKey != null)
+                    {
+                        regKey.SetValue("CodeBase", sDll2017Path, Microsoft.Win32.RegistryValueKind.String);
+                        regKey.Close();
+                    }
 
                     System.Windows.Forms.MessageBox.Show("You have SSDT for SQL Server " + VersionInfo.SqlServerFriendlyVersion + " installed. Please restart Visual Studio so BIDS Helper can reconfigure itself to work properly with that version of SSDT.", "BIDS Helper");
                     return true;