[pushed] diagnostics: handle logical locations with NULL name

[David Malcolm]

Successfully bootstrapped & regrtested on x86_64-pc-linux-gnu.
Successful run of analyzer integration tests on x86_64-pc-linux-gnu.
Pushed to trunk as r15-2467-g55982d1682921f.

gcc/ChangeLog:
        * diagnostic-path.cc
        (thread_event_printer::print_swimlane_for_event_range): Gracefully
        handle logical_location::get_name_for_path_output returning null.

Signed-off-by: David Malcolm <dmalc...@redhat.com>
---
 gcc/diagnostic-path.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/diagnostic-path.cc b/gcc/diagnostic-path.cc
index b497d89d059..37751843f9a 100644
--- a/gcc/diagnostic-path.cc
+++ b/gcc/diagnostic-path.cc
@@ -860,7 +860,8 @@ public:
     if (const logical_location *logical_loc = range->m_logical_loc)
       {
        label_text name (logical_loc->get_name_for_path_output ());
-       pp_printf (pp, "%qs: ", name.get ());
+       if (name.get ())
+         pp_printf (pp, "%qs: ", name.get ());
       }
     if (range->m_start_idx == range->m_end_idx)
       pp_printf (pp, "event %i",
-- 
2.26.3