Fix an issue with vswhere

If Visual Studio has been removed from the system, vswhere returned no output, crashing the program

Author: 4lex1v

code/main.cpp

@@ -158,7 +158,7 @@ int main (int argc, char **argv) {
   else {
     auto [status, default_toolchain] = discover_toolchain(&arena);
     if (!status) {
-      print(&arena, "Couldn't find any suitable C/C++ toolchain installed on the system.");
+      print(&arena, "Couldn't find any suitable C/C++ toolchain installed on the system.\n");
       return EXIT_FAILURE;
     }
 

code/toolchain_win32.cpp

@@ -62,12 +62,10 @@ static Result<String> get_msvc_installation_path (Memory_Arena *arena) {
 
   auto command = format_string(arena,  R"("%\\Microsoft Visual Studio\\Installer\\vswhere.exe" -property installationPath)", program_files_path);
   auto [vswhere_status, vs_path] = run_system_command(arena, command);
-  if (vswhere_status != Status_Code::Success) {
+  if ((vswhere_status != Status_Code::Success) || !vs_path.length) {
     return { Status_Code::Resource_Missing, "Couldn't find Visual Studio on the system." };
   }
 
-  assert(vs_path.length > 0);
-
   auto msvc_folder_query = format_string(arena, "%\\VC\\Tools\\MSVC\\*", vs_path);
 
   WIN32_FIND_DATA data;