updated rendering code to only run if text field is non-empty

Adaptive Card Editor UWP.sln

@@ -21,7 +21,9 @@ Global
 		Release|x86 = Release|x86
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{E2F5AF78-D3E6-43F9-AF44-F342449B63A5}.Debug|Any CPU.ActiveCfg = Debug|x86
+		{E2F5AF78-D3E6-43F9-AF44-F342449B63A5}.Debug|Any CPU.ActiveCfg = Debug|x64
+		{E2F5AF78-D3E6-43F9-AF44-F342449B63A5}.Debug|Any CPU.Build.0 = Debug|x64
+		{E2F5AF78-D3E6-43F9-AF44-F342449B63A5}.Debug|Any CPU.Deploy.0 = Debug|x64
 		{E2F5AF78-D3E6-43F9-AF44-F342449B63A5}.Debug|ARM.ActiveCfg = Debug|ARM
 		{E2F5AF78-D3E6-43F9-AF44-F342449B63A5}.Debug|ARM.Build.0 = Debug|ARM
 		{E2F5AF78-D3E6-43F9-AF44-F342449B63A5}.Debug|ARM.Deploy.0 = Debug|ARM

Adaptive Card Editor UWP/Adaptive Card Editor UWP.csproj

@@ -12,7 +12,7 @@
     <DefaultLanguage>en-US</DefaultLanguage>
     <TargetPlatformIdentifier>UAP</TargetPlatformIdentifier>
     <TargetPlatformVersion Condition=" '$(TargetPlatformVersion)' == '' ">10.0.18362.0</TargetPlatformVersion>
-    <TargetPlatformMinVersion>10.0.15063.0</TargetPlatformMinVersion>
+    <TargetPlatformMinVersion>10.0.17763.0</TargetPlatformMinVersion>
     <MinimumVisualStudioVersion>14</MinimumVisualStudioVersion>
     <FileAlignment>512</FileAlignment>
     <ProjectTypeGuids>{A5A43C5B-DE2A-4C0C-9213-0A381AF9435A};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
@@ -99,6 +99,7 @@
     <UseVSHostingProcess>false</UseVSHostingProcess>
     <ErrorReport>prompt</ErrorReport>
     <Prefer32Bit>true</Prefer32Bit>
+    <UseDotNetNativeToolchain>false</UseDotNetNativeToolchain>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Release|x64'">
     <OutputPath>bin\x64\Release\</OutputPath>
@@ -216,6 +217,14 @@
   <PropertyGroup Condition=" '$(VisualStudioVersion)' == '' or '$(VisualStudioVersion)' &lt; '14.0' ">
     <VisualStudioVersion>14.0</VisualStudioVersion>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|AnyCPU'">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <OutputPath>bin\Debug\</OutputPath>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Release|AnyCPU'">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <OutputPath>bin\Release\</OutputPath>
+  </PropertyGroup>
   <Import Project="$(MSBuildExtensionsPath)\Microsoft\WindowsXaml\v$(VisualStudioVersion)\Microsoft.Windows.UI.Xaml.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.

Adaptive Card Editor UWP/MainPage.xaml.cs

@@ -142,7 +142,11 @@ namespace Adaptive_Card_Editor_UWP
 
                     // clear the grid of existing content
                     grdCard.Children.Clear();
+                    grdTemplated.Children.Clear();
 
+                    // render the adaptive card content
+                    if (txtInput.Text.Length > 0)
+                    {
                         // render an adaptive card
                         try
                         {
@@ -186,6 +190,9 @@ namespace Adaptive_Card_Editor_UWP
                             templateOutput.Text = ex.ToString();
                             grdTemplated.Children.Add(templateOutput);
                         }
+                    }
+
+                    // update the XAML layout
                     grdCard.UpdateLayout();
 
                     isRendered = true;