Robot manager and GUI crashes on robot loading from GUI and adding a sensor

[etsardou]

To reproduce:

• Launch the simulator with GUI
• Press the 'Create robot' button
• Load an already stored robot (folder button located at the 'Robot' toolbar)
• Add a thermal sensor
• Add the robot to map

The problem seems to be related to a - introduced in the sensor's name.

[etsardou]

Output:

terminate called after throwing an instance of 'ros::InvalidNameException'
  what():  Character [-] at element [22] is not valid in Graph Resource Name [robot1/thermal_sensor_-1].  Valid characters are a-z, A-Z, 0-9, / and _.
terminate called after throwing an instance of 'ros::InvalidNameException'
  what():  Character [-] at element [22] is not valid in Graph Resource Name [robot1/thermal_sensor_-1].  Valid characters are a-z, A-Z, 0-9, / and _.