SERVER-99693 Fix hang analyzer crash when process_ids is empty (#31423) (#31534)

GitOrigin-RevId: a8e84ef397340e12a2f80d3e5bcb2937ca437c55

Author: juangugit

buildscripts/resmokelib/hang_analyzer/hang_analyzer.py

@@ -185,7 +185,8 @@ def _configure_processes(self):
         if self.options.debugger_output is None:
             self.options.debugger_output = ['stdout']
 
-        if self.options.process_ids is not None:
+        # add != "" check to avoid empty process_ids
+        if self.options.process_ids is not None and self.options.process_ids != "":
             # self.process_ids is an int list of PIDs
             self.process_ids = [int(pid) for pid in self.options.process_ids.split(',')]