三元表达式如果使用 Interface 或者 Primitive Class 作为选项，会出现 NullPointerException

[subchen]

如：

${ true ? "" : 0}

出现错误：

java.lang.NullPointerException
    at jetbrick.template.parser.support.PromotionUtils.getResultClassForConditionalOperator(PromotionUtils.java:201)
    at jetbrick.template.parser.JetTemplateCodeVisitor.visitExpr_conditional_ternary(JetTemplateCodeVisitor.java:1410)
    at jetbrick.template.parser.JetTemplateCodeVisitor.visitExpr_conditional_ternary(JetTemplateCodeVisitor.java:99)
    at jetbrick.template.parser.grammer.JetTemplateParser$Expr_conditional_ternaryContext.accept(JetTemplateParser.java:1640)
    at jetbrick.template.parser.JetTemplateCodeVisitor.visitValue(JetTemplateCodeVisitor.java:232)
    at jetbrick.template.parser.JetTemplateCodeVisitor.visitValue(JetTemplateCodeVisitor.java:99)
    at jetbrick.template.parser.grammer.JetTemplateParser$ValueContext.accept(JetTemplateParser.java:287)
    at jetbrick.template.parser.JetTemplateCodeVisitor.visitBlock(JetTemplateCodeVisitor.java:154)
    at jetbrick.template.parser.JetTemplateCodeVisitor.visitBlock(JetTemplateCodeVisitor.java:99)
    at jetbrick.template.parser.grammer.JetTemplateParser$BlockContext.accept(JetTemplateParser.java:153)
    at jetbrick.template.parser.JetTemplateCodeVisitor.visitTemplate(JetTemplateCodeVisitor.java:142)
    at jetbrick.template.parser.JetTemplateCodeVisitor.visitTemplate(JetTemplateCodeVisitor.java:99)
    at jetbrick.template.parser.grammer.JetTemplateParser$TemplateContext.accept(JetTemplateParser.java:103)
    at jetbrick.template.JetTemplate.generateJavaSource(JetTemplate.java:134)
    at jetbrick.template.JetTemplate.compileAndLoadClass(JetTemplate.java:101)
    at jetbrick.template.JetTemplate.checkLastModified(JetTemplate.java:77)
    at jetbrick.template.JetEngine.getTemplate(JetEngine.java:93)