Resolution for "The path must be absolute" on published projects

Trying to replace the internal "." folder with the local assembly path in order to have an absolute path for the PhysicalFileStorage class at startup ("The path must be absolute" error at startup for published projects)

May resolve the issue of #376 on dev

src/Microsoft.AspNetCore.Blazor.Server/BlazorConfig.cs

@@ -29,6 +29,11 @@ namespace Microsoft.AspNetCore.Blazor.Server
             var configLines = File.ReadLines(configFilePath).ToList();
             SourceMSBuildPath = configLines[0];
 
+            if (SourceMSBuildPath == ".")
+            {
+                SourceMSBuildPath = assemblyPath;
+            }
+
             var sourceMsBuildDir = Path.GetDirectoryName(SourceMSBuildPath);
             SourceOutputAssemblyPath = Path.Combine(sourceMsBuildDir, configLines[1]);