Avoid errors after missing INCLUDE with -MG (#1627)

src/asm/main.cpp

@@ -385,6 +385,7 @@ int main(int argc, char *argv[]) {
 	if (yy::parser parser; parser.parse() != 0 && nbErrors == 0)
 		nbErrors = 1;
 
+	if (!failedOnMissingInclude) {
 		sect_CheckUnionClosed();
 		sect_CheckLoadClosed();
 		sect_CheckSizes();
@@ -392,6 +393,7 @@ int main(int argc, char *argv[]) {
 		charmap_CheckStack();
 		opt_CheckStack();
 		sect_CheckStack();
+	}
 
 	if (nbErrors != 0)
 		errx("Assembly aborted (%u error%s)!", nbErrors, nbErrors == 1 ? "" : "s");

test/asm/errors-after-missing-include.asm

@@ -0,0 +1,10 @@
+PUSHC
+PUSHO
+PUSHS
+SECTION "test", WRAM0
+UNION
+INCLUDE "does not exist"
+ENDU
+POPS
+POPO
+POPC

test/asm/errors-after-missing-include.flags

@@ -0,0 +1 @@
+-Weverything -M /dev/null -MG