The parser invoke preamble token/event even when no preamble exists in the 
message
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                 Key: MIME4J-177
                 URL: https://issues.apache.org/jira/browse/MIME4J-177
             Project: JAMES Mime4j
          Issue Type: Bug
          Components: parser (core)
    Affects Versions: 0.6
            Reporter: Stefano Bagnara
            Assignee: Stefano Bagnara
             Fix For: 0.7


The token stream sends T_PREAMBLE tokens even when there is no preamble in the 
message making impossible to distinguish between messages with no preamble and 
messages with an empty preamble.

T_PREAMBLE should be called only when a preamble exists:

The rfc define multipart-body as:
     multipart-body := [preamble CRLF]
                       dash-boundary transport-padding CRLF
                       body-part *encapsulation
                       close-delimiter transport-padding
                       [CRLF epilogue] 

So preamble is optional (if the is a CRLF before the first boundary then you 
have a preamble).


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