also check that UUID of project is non-null when treating it as a package (#53789)

Fixes #53788

(cherry picked from commit 3e37e17)

Author: KristofferC

base/precompilation.jl

@@ -171,7 +171,7 @@ function ExplicitEnv(envpath::String=Base.active_project())
     sizehint!(weakdeps_expanded, length(deps))
     sizehint!(extensions_expanded, length(deps))
 
-    if proj_name !== nothing
+    if proj_name !== nothing && proj_uuid !== nothing
         deps_expanded[proj_uuid] = filter!(!=(proj_uuid), collect(values(project_deps)))
         extensions_expanded[proj_uuid] = project_extensions
         path = get(project_d, "path", nothing)