Generate more meaningful error message when one input file does not exist

                 Key: PIG-1001
             Project: Pig
          Issue Type: Bug
    Affects Versions: 0.4.0
            Reporter: Daniel Dai
             Fix For: 0.6.0

In the following query, if 2.txt does not exist, 

a = load '1.txt';
b = order a by $0;
c = load '2.txt';
d = order c by $0;
e = join b by $0, d by $0;
dump e;

Pig throws error message "ERROR 2100: file:/tmp/temp155054664/tmp1144108421 
does not exist.", Pig should deal with it with the error message "Input file 
2.txt not exist" instead of those confusing messages.

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