修改，增加非空判断

侯瑞军

2020-04-14 9b38de2269778eea9ef4a138d21e26d726fcecb5

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Êþº¾4
sendHtmlMail
G(Ljava/util/List;Ljava/lang/String;Ljava/lang/String;Ljava/util/List;)V

Exceptions 
    Signature
k(Ljava/util/List<Ljava/lang/String;>;Ljava/lang/String;Ljava/lang/String;Ljava/util/List<Ljava/io/File;>;)V

SourceFile
MailService.java
%com/kidgrow/email/service/MailService
java/lang/Object
javax/mail/MessagingException