Don't fail on empty programs (#1248)

Author: JulianGCalderon

src/statistics.rs

@@ -50,12 +50,9 @@ impl Statistics {
             && self.sierra_libfunc_count.is_some()
             && self.sierra_statement_count.is_some()
             && self.sierra_func_count.is_some()
-            && !self.sierra_libfunc_frequency.is_empty()
             && self.mlir_operation_count.is_some()
-            && !self.mlir_operations_by_libfunc.is_empty()
             && self.llvmir_instruction_count.is_some()
             && self.llvmir_virtual_register_count.is_some()
-            && !self.llvmir_opcode_frequency.is_empty()
             && self.compilation_total_time_ms.is_some()
             && self.compilation_sierra_to_mlir_time_ms.is_some()
             && self.compilation_mlir_passes_time_ms.is_some()