THROWS_WITH assertions false negative result in one case

**Describe the bug**
Just run:
```
CHECK_THROWS_WITH(throw 5, "Unknown exception");
```
...and it doesn't fail

**Expected behavior**
The test should fail with a message:
```
CHECK_THROWS_WITH( throw 5, "Unknown exception" )
with expansion:
no message equals: "Unknown exception"
```

**Reproduction steps**
```
CHECK_THROWS_WITH(throw 5, "Unknown exception");
```

**Platform information:**

- OS: **Linux**
- Compiler+version: **GCC v9.1.0**
- Catch version: **v2.11.0**

**Additional context**
–