[Ada] Invalid GPR_PROJECT_PATH_FILE confuses gnatls

[Pierre-Marie de Rodat]

This patch corrects an issue within gnatls whereby having an invalid
GPR_PROJECT_PATH_FILE causes an early abort when initializing the
default project path, leading to GPR_PROJECT_PATH being
ignored.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

	* gnatls.adb (Initialize_Default_Project_Path): Remove early
	abort on invalid path.
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