system: use block for big print message

Author: julianoes

mavsdk/system.py

@@ -172,7 +172,14 @@ def _start_mavsdk_server(system_address=None):
                                      stdout=subprocess.DEVNULL,
                                      stderr=subprocess.DEVNULL)
         except FileNotFoundError:
-            print("\nIt seems like this installation does not provide an embedded 'mavsdk_server' binary. If you installed from pip, it means that 'mavsdk_server' is not distributed for your platform (yet). You will need to get and run it manually:\n\n  1. Download 'mavsdk_server' from releases: https://github.com/mavlink/mavsdk/releases (or build it from source).\n  2. Run it, e.g. on port 50051: './mavsdk_server -p 50051'.\n  3. Set the 'mavsdk_server_address' and port when creating the System:\n     'drone = System(mavsdk_server_address='localhost', port=50051)'\n")
+            print("""
+                  It seems like this installation does not provide an embedded 'mavsdk_server' binary. If you installed from pip, it means that 'mavsdk_server' is not distributed for your platform (yet). You will need to get and run it manually:
+
+                    1. Download 'mavsdk_server' from releases: https://github.com/mavlink/mavsdk/releases (or build it from source).
+                    2. Run it, e.g. on port 50051: './mavsdk_server -p 50051'.
+                    3. Set the 'mavsdk_server_address' and port when creating the System:
+                       'drone = System(mavsdk_server_address='localhost', port=50051)'
+                  """)
             sys.exit(1)