Set weight=0 has no effect #7

Description:
Set weight=0 has no effect.

Steps To Reproduce:

1. Make a graph with two out-edge from v_Begin:

• e_A with label:
  e_A {new line}
  weight=0
• e_B with label:
  e_B

2. Run using this command
   java -jar graphwalker.jar offline -g RANDOM -f ./weight_AB.graphml -s TEST_LENGTH:100 -w
3. You can see ratios flow though e_A and e_B are equal.

Expected result:
Ratio of e_B is 100%, and ratio of e_A is 0%.

More information:
weight=0.00 has the same issue.
weight=-0 has the same issue.
weight=-0.00 has the same issue.
weight=0.01 is work as expected.

Attach file (graphs):
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Sorry for my english!