Fix NemerleAll.nproj and detection of external parser loading.

Author: VladD2

NemerleAll.nproj

@@ -533,7 +533,7 @@
     <Exec Command="$(Nuget) pack Nemerle.Compiler.nuspec -OutputDirectory &quot;$(NugetOutput)&quot; -Properties &quot;$(NugetProperties)&quot;" WorkingDirectory="$(NRoot)" />
   </Target>
 
-  <Target Name="DevBuildQuickNccOnly"    DependsOnTargets="Stage1;                                                                                Install" />
+  <Target Name="DevBuildQuickNccOnly"    DependsOnTargets="Stage1; Linq;Unsafe;_PegAndCSharp;                                                     Install" />
   <Target Name="DevBuildQuick"           DependsOnTargets="Stage1;                          _NugetPack; _Integration;                             Install" />
   <Target Name="DevBuildQuickWithTests"  DependsOnTargets="Stage1;           CompilerTests; _NugetPack; _Integration; IdeEngineTests;             Install" />
   <Target Name="DevBuild2Stage"          DependsOnTargets="Stage2;                          _NugetPack; _Integration;                             Install" />

ncc/external/LibraryReferenceManager.n

@@ -97,7 +97,7 @@ namespace Nemerle.Compiler
         };
 
       mutable libraryReference;
-      
+
       if (assembly == null)
       {
         def msg = $"cannot find assembly `$name'";
@@ -124,7 +124,7 @@ namespace Nemerle.Compiler
     public AddAssembly (assembly : SR.Assembly, isUserReference : bool) : void
     {
       mutable libraryReference;
-      
+
       if (_loaded_assemblies_by_name.TryGetValue(assembly.FullName, out libraryReference))
         when (isUserReference && !libraryReference.IsUserReference)
           libraryReference.IsUserReference = isUserReference;
@@ -441,11 +441,11 @@ namespace Nemerle.Compiler
     {
       assert(assembly != null);
 
-      def assemblyAttributes = assembly.GetCustomAttributes(false);
-      def parserDefs = assemblyAttributes.Filter(t => t.GetType().FullName == "Nemerle.Internal.RegisterParserAttribute");
-
       try
       {
+        def assemblyAttributes = assembly.GetCustomAttributes(false);
+        def parserDefs = assemblyAttributes.Filter(t => t.GetType().FullName == "Nemerle.Internal.RegisterParserAttribute");
+
         foreach(definition in parserDefs)
         {
           def parserTypeName = late(definition.Name) :> string;