Do not crash if expected CTCSS tones not sepcified

Also added expected CTCSS tones to Icom IC-7300 capabilities.

icom/ic7300.c

@@ -40,7 +40,7 @@
 #include "frame.h"
 #include "misc.h"
 #include "bandplan.h"
-
+#include "tones.h"
 
 /* AM Data mode needs adding - this would require one more mode 'RIG_MODE_PKTAM' to rig.h */
 #define IC7300_ALL_RX_MODES (RIG_MODE_AM|RIG_MODE_CW|RIG_MODE_CWR|RIG_MODE_SSB|RIG_MODE_RTTY|RIG_MODE_RTTYR|RIG_MODE_PKTLSB|RIG_MODE_PKTUSB)
@@ -115,7 +115,7 @@ const struct rig_caps ic7300_caps = {
 	[LVL_RAWSTR] = { .min = { .i = 0 }, .max = { .i = 255 } },
 },
 .parm_gran =  {},
-.ctcss_list =  NULL,
+.ctcss_list =  full_ctcss_list,
 .dcs_list =  NULL,
 .preamp =   { 10, RIG_DBLST_END, },	/* FIXME: TBC it's a guess*/
 .attenuator =   { 20, RIG_DBLST_END, }, /* value taken from p.45 of manual*/

icom/icom.c

@@ -2623,12 +2623,14 @@ int icom_set_ctcss_tone(RIG *rig, vfo_t vfo, tone_t tone)
 
 	caps = rig->caps;
 
-	for (i = 0; caps->ctcss_list[i] != 0 && i<52; i++) {
+	if (caps->ctcss_list) {
-		if (caps->ctcss_list[i] == tone)
+		for (i = 0; caps->ctcss_list[i] != 0 && i<52; i++) {
-			break;
+			if (caps->ctcss_list[i] == tone)
+				break;
+		}
+		if (caps->ctcss_list[i] != tone)
+			return -RIG_EINVAL;
 	}
-	if (caps->ctcss_list[i] != tone)
-		return -RIG_EINVAL;
 
     /* Sent as frequency in tenth of Hz */
 
@@ -2677,6 +2679,8 @@ int icom_get_ctcss_tone(RIG *rig, vfo_t vfo, tone_t *tone)
 	tone_len -= 2;
 	*tone = from_bcd_be(tonebuf+2, tone_len*2);
 
+	if (!caps->ctcss_list) return RIG_OK;
+
 	/* check this tone exists. That's better than nothing. */
 	for (i = 0; caps->ctcss_list[i] != 0 && i<52; i++) {
 		if (caps->ctcss_list[i] == *tone)