avoid empty format string to fix compilation with clang 2.8 on 64-bit Fedora 14:
avoid empty format string to fix compilation with clang 2.8 on 64-bit Fedora 14:

pathfinder/compiler/debug/abssynprint.c:538:46: error: format string is empty [-Wformat-zero-length]
                PFprettyprintf (n->sem.tru ? "" : "value of");
                                             ^~

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