[PATCH v4 17/44] gdb: allow inferiors without threads in all_matching_threads_iterator

When iterating over all threads, the iterator already skips inferiors
without threads.  When iterating over a specific inferior, however, the
iterator crashes when encountering an inferior without threads.

Fix it.
---
 gdb/thread-iter.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gdb/thread-iter.c b/gdb/thread-iter.c
index d7ccb176d61..2a424088b6e 100644
--- a/gdb/thread-iter.c
+++ b/gdb/thread-iter.c
@@ -113,7 +113,7 @@ all_matching_threads_iterator::all_matching_threads_iterator
 	  m_mode = mode::ALL_THREADS_OF_INFERIOR;
 
 	  m_inf = find_inferior_pid (filter_target, filter_ptid.pid ());
-	  if (m_inf != nullptr)
+	  if (m_inf != nullptr && !m_inf->thread_list.empty ())
 	    m_thr = &m_inf->thread_list.front ();
 	}
       else
-- 
2.43.0

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