Give a readable error in mtr if resolve_at_variable fails
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@ -347,8 +347,15 @@ sub resolve_at_variable {
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or croak "There is no group named '$group_name' that ",
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"can be used to resolve '$option_name' for test '$self->{testname}'";
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my $value= $from_group->value($option_name) || '';
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$res .= $before.$value;
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my $value= $from_group->value($option_name);
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if (!defined($value))
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{
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::mtr_verbose("group: $group_name option_name: $option_name is undefined");
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}
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else
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{
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$res .= $before.$value;
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}
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}
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$res .= $after;
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