added note about StackTrace not being a crash

direct/src/showbase/PythonUtil.py

@@ -129,6 +129,7 @@ class StackTrace:
             self.label, len(self.trace),)
         for i in traceback.format_list(self.trace):
             r+=i
+        r+="***** NOTE: This is not a crash. This is a debug stack trace. *****"
         return r
 
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