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libtags: modules: ignore empty title

--- a/sys/src/cmd/audio/libtags/it.c

+++ b/sys/src/cmd/audio/libtags/it.c

@@ -8,8 +8,8 @@

 	if(ctx->read(ctx, d, 4+26) != 4+26 || memcmp(d, "IMPM", 4) != 0)

 		return -1;

 	d[4+26] = 0;

-	cp437toutf8(o, sizeof(o), d+4, 26);

-	txtcb(ctx, Ttitle, "", o);

+	if(cp437toutf8(o, sizeof(o), d+4, 26) > 0)

+		txtcb(ctx, Ttitle, "", o);

 	return 0;

 }

--- a/sys/src/cmd/audio/libtags/mod.c

+++ b/sys/src/cmd/audio/libtags/mod.c

@@ -41,8 +41,8 @@

 		return -1;

 	if(ctx->read(ctx, d, 20) != 20)

 		return -1;

-	cp437toutf8(o, sizeof(o), d, 20);

-	txtcb(ctx, Ttitle, "", o);

+	if(cp437toutf8(o, sizeof(o), d, 20) > 0)

+		txtcb(ctx, Ttitle, "", o);

 	return 0;

 }

--- a/sys/src/cmd/audio/libtags/s3m.c

+++ b/sys/src/cmd/audio/libtags/s3m.c

@@ -10,8 +10,8 @@

 	d[28] = 0;

 	for(s = d+27; s != d-1 && (*s == ' ' || *s == 0); s--);

 	s[1] = 0;

-	cp437toutf8(o, sizeof(o), d, s+1-d);

-	txtcb(ctx, Ttitle, "", o);

+	if(cp437toutf8(o, sizeof(o), d, s+1-d) > 0)

+		txtcb(ctx, Ttitle, "", o);

 	return 0;

 }

--- a/sys/src/cmd/audio/libtags/xm.c

+++ b/sys/src/cmd/audio/libtags/xm.c

@@ -9,8 +9,8 @@

 		return -1;

 	d[17+20] = 0;

 	for(s = d+17; *s == ' '; s++);

-	cp437toutf8(o, sizeof(o), d+17, 20);

-	txtcb(ctx, Ttitle, "", o);

+	if(cp437toutf8(o, sizeof(o), d+17, 20) > 0)

+		txtcb(ctx, Ttitle, "", o);

 	return 0;

 }