[gnome-builder] context: warn about invalid project paths at early startup

[Christian Hergert <chergert src gnome org>]

commit f088829c05594efedd696832f8641e7719d1be13
Author: Christian Hergert <chergert redhat com>
Date:   Wed Jan 24 18:27:29 2018 -0800

    context: warn about invalid project paths at early startup
    
    We cannot generate a path properly before the project id has been
    generated, and that needs to have the VCS loaded to get the project
    name/directory from the workdir.

 src/libide/ide-context.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)
---
diff --git a/src/libide/ide-context.c b/src/libide/ide-context.c
index ba780aaa8..eca239db0 100644
--- a/src/libide/ide-context.c
+++ b/src/libide/ide-context.c
@@ -2623,17 +2623,22 @@ ide_context_cache_file (IdeContext  *self,
 {
   g_autoptr(GPtrArray) ar = NULL;
   g_autofree gchar *path = NULL;
+  const gchar *project_id;
   const gchar *part = first_part;
   va_list args;
 
   g_return_val_if_fail (IDE_IS_CONTEXT (self), NULL);
+  g_return_val_if_fail (IDE_IS_PROJECT (self->project), NULL);
   g_return_val_if_fail (first_part != NULL, NULL);
 
+  project_id = ide_project_get_id (self->project);
+  g_return_val_if_fail (project_id != NULL, NULL);
+
   ar = g_ptr_array_new ();
   g_ptr_array_add (ar, (gchar *)g_get_user_cache_dir ());
   g_ptr_array_add (ar, (gchar *)ide_get_program_name ());
   g_ptr_array_add (ar, (gchar *)"projects");
-  g_ptr_array_add (ar, (gchar *)ide_project_get_id (self->project));
+  g_ptr_array_add (ar, (gchar *)project_id);
 
   va_start (args, first_part);
   do
@@ -2675,16 +2680,21 @@ ide_context_cache_filename (IdeContext  *self,
 {
   g_autoptr(GPtrArray) ar = NULL;
   const gchar *part = first_part;
+  const gchar *project_id;
   va_list args;
 
   g_return_val_if_fail (IDE_IS_CONTEXT (self), NULL);
+  g_return_val_if_fail (IDE_IS_PROJECT (self->project), NULL);
   g_return_val_if_fail (first_part != NULL, NULL);
 
+  project_id = ide_project_get_id (self->project);
+  g_return_val_if_fail (project_id != NULL, NULL);
+
   ar = g_ptr_array_new ();
   g_ptr_array_add (ar, (gchar *)g_get_user_cache_dir ());
   g_ptr_array_add (ar, (gchar *)ide_get_program_name ());
   g_ptr_array_add (ar, (gchar *)"projects");
-  g_ptr_array_add (ar, (gchar *)ide_project_get_id (self->project));
+  g_ptr_array_add (ar, (gchar *)project_id);
 
   va_start (args, first_part);
   do