mpm: Add LogRuntimeError class

This inherits RuntimeError and saves from logging and throwing in
separate steps. Instead of

```python
log.error("Error X occured!")
raise RuntimeError("Error X occured!")
```
do
```python
raise LogRuntimeError(log, "Error X occured!")
```

1 files changed, 10 insertions, 0 deletions

diff --git a/mpm/python/usrp_mpm/mpmutils.py b/mpm/python/usrp_mpm/mpmutils.py
index 861f8ac49..1f7bd7107 100644
--- a/mpm/python/usrp_mpm/mpmutils.py
+++ b/mpm/python/usrp_mpm/mpmutils.py
@@ -317,3 +317,13 @@ class LogWrapper:
         """
         return getattr(self._wc, k)
 # pylint: enable=too-few-public-methods
+
+
+class LogRuntimeError(RuntimeError):
+    """
+    Custom version of RuntimeError that also prints the exception message to
+    a logger.
+    """
+    def __init__(self, log, message):
+        log.error(message)
+        super.__init__(message)