Make QueryServiceConfigW return an empty string for empty dependencies

[Troy Rollo]

QueryServiceConfigW currently returns a NULL pointer for lpDependencies when 
there are no dependencies. The documentation states that an empty string has 
the same meaning, and at least one application (an MSIEXEC.EXE from the 
Office XP CD) will SEGV if this is NULL. Using the empty string avoids this.

ChangeLog:
 Return an empty string for service dependencies when there are no
 dependencies, rather than a NULL pointer, which causes some apps
 to SEGV.
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