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For example if we have bossac 1.7.1 and 1.9.0 installed, this will
result in the following properties available during upload:

{runtime.tools.bossac-1.7.0-arduino3.path} => /path/to/bossac/1.7.0
{runtime.tools.bossac-1.9.0-arduino3.path} => /path/to/bossac/1.9.0
{runtime.tools.bossac.path} => /path/to/bossac/1.9.0

some platforms fails to correctly specify the version of the tool in the
package_index.json but they do the correct specification in the recipes.
This patch allows to not fail in this latter case.