[FIX] tools: return data from exec_command_pipe call
Rendering of workflow uses it, returns the pdf data
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@ -90,7 +90,7 @@ def exec_command_pipe(name, *args):
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prog = find_in_path(name)
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if not prog:
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raise Exception('Command `%s` not found.' % name)
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_exec_pipe(prog, *args)
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return _exec_pipe(prog, *args)
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#----------------------------------------------------------
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# Postgres subprocesses
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