[llvm-bugs] [Bug 41513] New: [yaml2obj] will crash when reading a yaml file which only contains comments.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41513

            Bug ID: 41513
           Summary: [yaml2obj] will crash when reading a yaml file which
                    only contains comments.
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: higuoxing at gmail.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

yaml2obj will crash if it reads a yaml file only contains comments. e.g.

```
$ cat empty.yaml
# some comment
$ yaml2obj empty.yaml
Stack dump:
0.      Program arguments:
/Users/cat/Workspace/llvm/llvm-tools-lld-build/bin/yaml2obj empty.yaml
0  yaml2obj                 0x0000000106d96138
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 40
1  yaml2obj                 0x0000000106d952b5 llvm::sys::RunSignalHandlers() +
85
2  yaml2obj                 0x0000000106d967a8 SignalHandler(int) + 264
3  libsystem_platform.dylib 0x00007fffbf796b3a _sigtramp + 26
4  libsystem_platform.dylib 0x00007fff58f65060 _sigtramp + 2575099200
5  yaml2obj                 0x0000000106d4d1fd
llvm::yaml::MappingTraits<llvm::yaml::YamlObjectFile>::mapping(llvm::yaml::IO&,
llvm::yaml::YamlObjectFile&) + 141
6  yaml2obj                 0x0000000106c9cc0c main + 892
7  libdyld.dylib            0x00007fffbf587235 start + 1
8  libdyld.dylib            0x0000000000000002 start + 1084722638
[1]    2847 segmentation fault 
~/Workspace/llvm/llvm-tools-lld-build/bin/yaml2obj empty.yaml
```

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