Fixes Pretty Printer#635
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…tead of throwing an exception
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Unnamed local variable declarations occur e.g. in domain functions, where parameter names are optional.
Although part of the Viper AST, the pretty printer currently crashes when invoking
prettywith such an AST node.This PR addresses this issue, which fixes Viper-IDE #343 because nodes are pretty printed while computing hashes for cacheing (although pretty printing only happens for logging purposes)