minimum distance of all 0 code raised mysterious error message #6486
Description
This should return a more useful error message:
sage: G = matrix(GF(2),[[0,0,0]])
sage: C = LinearCode(G)
sage: C.list()
[(0, 0, 0)]
sage: C.minimum_distance()
---------------------------------------------------------------------------
IndexError Traceback (most recent call last)
/home/wdj/.sage/temp/tinah/7902/_home_wdj__sage_init_sage_0.py in <module>()
/home/wdj/sagefiles/sage-4.1.rc1/local/lib/python2.6/site-packages/sage/coding/linear_code.pyc in minimum_distance(self, method)
1681 return ZZ(d)
1682 Gstr = "%s*Z(%s)^0"%(gapG, q)
-> 1683 return hamming_weight(min_wt_vec_gap(Gstr,n,k,F))
1684
1685 def module_composition_factors(self,gp):
/home/wdj/sagefiles/sage-4.1.rc1/local/lib/python2.6/site-packages/sage/coding/linear_code.pyc in min_wt_vec_gap(Gmat, n, k, F, method)
379 #print [gap.eval("v["+str(i+1)+"]") for i in range(n)]
380 all.append([v._matrix_(F),m._matrix_(F),int(dist)])
--> 381 ans = all[0]
382 for x in all:
383 if x[2]<ans[2] and x[2]>0:
IndexError: list index out of range
Component: coding theory
Author: Sebastian Pancratz
Reviewer: Craig Citro
Merged: sage-4.3.2.alpha0
Issue created by migration from https://trac.sagemath.org/ticket/6486