LogAnalyzer: TestPitchRollCoupling add mode ""

- "" is a valid alias for AUTOTUNE

Tools/LogAnalyzer/tests/TestPitchRollCoupling.py

@@ -28,7 +28,7 @@ class TestPitchRollCoupling(Test):
 		# figure out where each mode begins and ends, so we can treat auto and manual modes differently and ignore acro/tune modes
 		autoModes   = ["RTL","AUTO","LAND","LOITER","GUIDED","CIRCLE","OF_LOITER","HYBRID"]     # use NTUN DRol+DPit
 		manualModes = ["STABILIZE","DRIFT","ALTHOLD","ALT_HOLD"]                                 # use CTUN RollIn/DesRoll + PitchIn/DesPitch
-		ignoreModes = ["ACRO","SPORT","FLIP","AUTOTUNE"]                               # ignore data from these modes
+		ignoreModes = ["ACRO","SPORT","FLIP","AUTOTUNE",""]                            # ignore data from these modes
 		autoSegments   = []  # list of (startLine,endLine) pairs
 		manualSegments = []  # list of (startLine,endLine) pairs
 		orderedModes = collections.OrderedDict(sorted(logdata.modeChanges.items(), key=lambda t: t[0]))