Don't create _global_symbols if global_scope has no symbol

Author: czgdp1807

src/libasr/pass/global_symbols.cpp

@@ -17,6 +17,9 @@ namespace LCompilers {
 void pass_wrap_global_syms_into_module(Allocator &al,
         ASR::TranslationUnit_t &unit,
         const LCompilers::PassOptions &/*pass_options*/) {
+    if( unit.m_global_scope->get_scope().size() == 0 ) {
+        return ;
+    }
     Location loc = unit.base.base.loc;
     char *module_name = s2c(al, "_global_symbols");
     SymbolTable *module_scope = al.make_new<SymbolTable>(unit.m_global_scope);