Moved VirtualEnv to Query and deleted from Create

Author: jamesramsden-bh

Python_Engine/Create/VirtualEnvironment.cs

@@ -77,7 +77,6 @@
     <Compile Include="Compute\Logging.cs" />
     <Compile Include="Convert\ToPython.cs" />
     <Compile Include="Modify\AddQuotesIfRequired.cs" />
-    <Compile Include="Create\VirtualEnvironment.cs" />
     <Compile Include="Query\VirtualEnv.cs" />
     <Compile Include="Query\VirtualEnvPythonExePath.cs" />
     <Compile Include="Query\VirtualEnvDirectory.cs" />
@@ -102,7 +101,9 @@
       <Private>False</Private>
     </ProjectReference>
   </ItemGroup>
-  <ItemGroup />
+  <ItemGroup>
+    <Folder Include="Create\" />
+  </ItemGroup>
   <ItemGroup>
     <Content Include="Python\src\python_toolkit\bhom\analytics.py" />
     <Content Include="Python\src\python_toolkit\bhom\anonymise_filepath.py" />

Python_Engine/Python_Engine.csproj

@@ -35,7 +35,16 @@ public static partial class Query
         [Output("The virtual environment, if it exists.")]
         public static PythonEnvironment VirtualEnv(string envName)
         {
-            return new PythonEnvironment() { Executable = VirtualEnvPythonExePath(envName), Name = envName };
+            string exePath = Query.VirtualEnvPythonExePath(envName);
+            if (File.Exists(exePath))
+            {
+                return new PythonEnvironment() { Name = envName, Executable = exePath };
+            }
+            else
+            {
+                BH.Engine.Base.Compute.RecordError($"No environment could be found for {envName}. Use the appropriate InstallPythonEnv to install this environment.");
+                return null;
+            }
         }
     }
 }