Why CHECK in regular logic?

[acelyc111]

Describe the bug (描述bug)
I found a coredump with backtrace:

(gdb) bt
#0  0x00007f5aa1e5e1d7 in raise () from /lib64/libc.so.6
#1  0x00007f5aa1e5f8c8 in abort () from /lib64/libc.so.6
#2  0x0000000001a707a6 in google::DumpStackTraceAndExit () at src/utilities.cc:147
#3  0x0000000001a67aad in google::LogMessage::Fail () at src/logging.cc:1599
#4  0x0000000001a69934 in google::LogMessage::SendToLog (this=0x7f5a0d0cc2e0) at src/logging.cc:1553
#5  0x0000000001a675d4 in google::LogMessage::Flush (this=0x7f5a0d0cc2e0) at src/logging.cc:1422
#6  0x0000000001a6a369 in google::LogMessageFatal::~LogMessageFatal (this=<optimized out>, __in_chrg=<optimized out>) at src/logging.cc:2125
#7  0x0000000001d42dd5 in brpc::DisplayResult (cntl=cntl@entry=0xd56ec80, done=done@entry=0xc01f8c0, prof_name=prof_name@entry=0x7f5a0d0cc860 "./rpc_data/profiling/eb598baf59d1fd3155c1d979479024f6/20200511.124545.cpu", result_prefix=...)
    at /root/doris/doris-dev/thirdparty/src/incubator-brpc-0.9.5/src/brpc/builtin/hotspots_service.cpp:504
#8  0x0000000001d44d0f in brpc::DoProfiling (type=brpc::PROFILING_CPU, cntl_base=0xd56ec80, done=0xc01f8c0) at /root/doris/doris-dev/thirdparty/src/incubator-brpc-0.9.5/src/brpc/builtin/hotspots_service.cpp:740
#9  0x0000000001c88ed8 in brpc::hotspots::CallMethod (this=0x9ce1a80, method=<optimized out>, controller=0xd56ec80, request=0xd603fe0, response=0xd878760, done=0xc01f8c0) at /root/doris/doris-dev/thirdparty/src/incubator-brpc-0.9.5/build/brpc/builtin_service.pb.cc:10451
#10 0x0000000001bdefb4 in brpc::policy::ProcessHttpRequest (msg=<optimized out>) at /root/doris/doris-dev/thirdparty/src/incubator-brpc-0.9.5/src/brpc/policy/http_rpc_protocol.cpp:1467
#11 0x0000000001bac227 in brpc::ProcessInputMessage (void_arg=void_arg@entry=0xc46e2d0) at /root/doris/doris-dev/thirdparty/src/incubator-brpc-0.9.5/src/brpc/input_messenger.cpp:133
#12 0x0000000001bad0a1 in operator() (this=<optimized out>, last_msg=0xc46e2d0) at /root/doris/doris-dev/thirdparty/src/incubator-brpc-0.9.5/src/brpc/input_messenger.cpp:139
#13 brpc::InputMessenger::OnNewMessages (m=0xc4b9800) at /usr/include/c++/7.3.0/bits/unique_ptr.h:268
#14 0x0000000001c55f6d in brpc::Socket::ProcessEvent (arg=0xc4b9800) at /root/doris/doris-dev/thirdparty/src/incubator-brpc-0.9.5/src/brpc/socket.cpp:1077
#15 0x0000000001d08167 in bthread::TaskGroup::task_runner (skip_remained=<optimized out>) at /root/doris/doris-dev/thirdparty/src/incubator-brpc-0.9.5/src/bthread/task_group.cpp:293
#16 0x0000000001cf4531 in bthread_make_fcontext ()
#17 0x0000000000000000 in ?? ()

https://github.com/apache/incubator-brpc/blob/master/src/brpc/builtin/hotspots_service.cpp#L592

好奇这里为什么有一个CHECK(!use_html);，其他地方对于use_html是true或false都有正常的处理逻辑，为什么这里不能为true呢？