Update signal_provider.py (#98)

This fixes a bug when loading mat files recorded with YarpLoggerDevice and then modified with a recent Matlab

Author: LoreMoretti

robot_log_visualizer/file_reader/signal_provider.py

@@ -76,6 +76,8 @@ def __populate_text_logging_data(self, file_object):
                 continue
             if key == "#refs#":
                 continue
+            if key == "#subsystem#":
+                continue
             if "data" in value.keys():
                 data[key] = {}
                 level_ref = value["data"]["level"]
@@ -122,6 +124,8 @@ def __populate_numerical_data(self, file_object):
                 continue
             if key == "#refs#":
                 continue
+            if key == "#subsystem#":
+                continue
             if key == "log":
                 continue
             if "data" in value.keys():