Fix TestCommandScript: return an error if target executable is not set

The test invokes the 'targetname' test command before setting a
target executable, which caused Python to raise TypeError: cannot
concatenate 'str' and 'NoneType' objects.

llvm.org/pr23686

llvm-svn: 238425

1 files changed, 7 insertions, 3 deletions

diff --git a/lldb/test/functionalities/command_script/welcome.py b/lldb/test/functionalities/command_script/welcome.py
index c6d4ddcfd40..f7e6a7ebc74 100644
--- a/lldb/test/functionalities/command_script/welcome.py
+++ b/lldb/test/functionalities/command_script/welcome.py
@@ -16,11 +16,15 @@ class TargetnameCommand(object):
         pass
 
     def __call__(self, debugger, args, exe_ctx, result):
-        target = debugger.GetSelectedTarget()
-        file = target.GetExecutable()
-        print >>result,  ('Current target ' + file.GetFilename())
         if args == 'fail':
             result.SetError('a test for error in command')
+            return
+        target = debugger.GetSelectedTarget()
+        file = target.GetExecutable()
+        if file:
+            print >>result,  ('Current target ' + file.GetFilename())
+        else:
+            result.SetError('target.GetExecutable() failed')
     
     def get_flags(self):
         return lldb.eCommandRequiresTarget