Made NoOpSpan compatible to Transactions. (#2364)

Added missing methods from the Transaction to the NoOpSpan because start_transaction sometimes returns a Span (and thus sometimes a NoOpSpan)

sentry_sdk/tracing.py

@@ -876,6 +876,11 @@ def __repr__(self):
         # type: () -> str
         return self.__class__.__name__
 
+    @property
+    def containing_transaction(self):
+        # type: () -> Optional[Transaction]
+        return None
+
     def start_child(self, instrumenter=INSTRUMENTER.SENTRY, **kwargs):
         # type: (str, **Any) -> NoOpSpan
         return NoOpSpan()
@@ -892,6 +897,10 @@ def to_baggage(self):
         # type: () -> Optional[Baggage]
         return None
 
+    def get_baggage(self):
+        # type: () -> Optional[Baggage]
+        return None
+
     def iter_headers(self):
         # type: () -> Iterator[Tuple[str, str]]
         return iter(())
@@ -928,6 +937,22 @@ def finish(self, hub=None, end_timestamp=None):
         # type: (Optional[sentry_sdk.Hub], Optional[datetime]) -> Optional[str]
         pass
 
+    def set_measurement(self, name, value, unit=""):
+        # type: (str, float, MeasurementUnit) -> None
+        pass
+
+    def set_context(self, key, value):
+        # type: (str, Any) -> None
+        pass
+
+    def init_span_recorder(self, maxlen):
+        # type: (int) -> None
+        pass
+
+    def _set_initial_sampling_decision(self, sampling_context):
+        # type: (SamplingContext) -> None
+        pass
+
 
 def trace(func=None):
     # type: (Any) -> Any