Skip tokenizer validation when no tokenizer is used. (#1474)
Skip tokenizer validation when no tokenizer is used. (#1474)

For example, if command line arguments or files are being minimized, we
don't need to use a tokenizer. This avoids an exception during
validation.
google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz