deal with missing trailing zeros

Some of these db's do csv dumps that miss the final empty entries. it seems to be only the trailing values.

fast cheap solution is: do we propose a better one?

def append_trailing_comas(L_L, target=None):
if target==None:
target = len(L_L[0])
for x in range(len(L_L)):
if len(L_L[x]) != target:
r = target-len(L_L[x])
for y in range(r):
L_L[x].append('')
return L_L