if cond: return val - bug in unparse

[gdraheim]

During testing with python3.11 it showed a common bug:

• when an if-statement is followed by a return statement ON THE SAME LINE
• then the return statement moves to the end of the enclosing block of the if-statement

or more graphic:

if x == 1: return 1
if x == 2: return 2

with ast.unparse() making it

if x == 1: pass
if x == 2: pass
return 1
return 2

Workaround - put the return statement on a seperate line in the input python sources.