Fix issues with system_message rendering

chat_template.json

@@ -1,3 +1,3 @@
 {
-  "chat_template": "{%- if messages[0][\"role\"] == \"system\" %}\n    {%- set system_message = messages[0][\"content\"] %}\n    {%- set loop_messages = messages[1:] %}\n{%- else %}\n    {%- set loop_messages = messages %}\n{%- endif %}\n\n{{- bos_token }}\n{%- for message in loop_messages %}\n    {%- if (message['role'] == 'user') != (loop.index0 % 2 == 0) %}\n        {{- raise_exception('After the optional system message, conversation roles must alternate user/assistant/user/assistant/...') }}\n    {%- endif %}\n    {%- if message[\"role\"] == \"user\" %}\n        {%- if loop.last and system_message is defined %}\n            {{- \"[INST]\" + system_message + \"\n\n\" }}\n        {%- else %}\n            {{- \"[INST]\" }}\n        {%- endif %}\n        {%- if message[\"content\"] is not string %}\n            {%- for chunk in message[\"content\"] %}\n                {%- if chunk[\"type\"] == \"text\" %}\n                    {{- chunk[\"content\"] }}\n                {%- elif chunk[\"type\"] == \"image\" %}\n                    {{- \"[IMG]\" }}\n                {%- else %}\n                    {{- raise_exception(\"Unrecognized content type!\") }}\n                {%- endif %}\n            {%- endfor %}\n        {%- else %}\n            {{- message[\"content\"] }}\n        {%- endif %}\n        {{- \"[/INST]\" }}\n    {%- elif message[\"role\"] == \"assistant\" %}\n        {{- message[\"content\"] + eos_token}}\n    {%- else %}\n        {{- raise_exception(\"Only user and assistant roles are supported, with the exception of an initial optional system message!\") }}\n    {%- endif %}\n{%- endfor %}"
+  "chat_template": "{%- if messages[0][\"role\"] == \"system\" %}\n	{%- if messages[0][\"content\"] is not string %}\n		{%- if len(messages[0][\"content\"]) != 1 %}\n			{{- raise_exception(\"Multiple messages in system prompt are not supported!\") }}\n    	{%- endif %}\n        {%- if message[\"content\"][0][\"type\"] == \"text\" %}\n            {{- set system_message = message[\"content\"][0][\"content\"] }}\n        {%- else %}\n            {{- raise_exception(\"Unrecognized content type for system message!\") }}\n        {%- endif %}\n    {%- else %}\n        {{- set system_message = messages[0][\"content\"] }}\n    {%- endif %}\n    {%- set loop_messages = messages[1:] %}\n    {%- else %}\n    {%- set loop_messages = messages %}\n    {%- endif %}\n\n{{- bos_token }}\n{%- for message in loop_messages %}\n    {%- if (message[\'role\'] == \'user\') != (loop.index0 % 2 == 0) %}\n        {{- raise_exception(\'After the optional system message, conversation roles must alternate user/assistant/user/assistant/...\') }}\n    {%- endif %}\n    {%- if message[\"role\"] == \"user\" %}\n        {%- if loop.last and system_message is defined %}\n            {{- \"[INST]\" + system_message + \"\n\n            \" }}\n        {%- else %}\n            {{- \"[INST]\" }}\n        {%- endif %}\n        {%- if message[\"content\"] is not string %}\n            {%- for chunk in message[\"content\"] %}\n                {%- if chunk[\"type\"] == \"text\" %}\n                    {{- chunk[\"content\"] }}\n                {%- elif chunk[\"type\"] == \"image\" %}\n                    {{- \"[IMG]\" }}\n                {%- else %}\n                    {{- raise_exception(\"Unrecognized content type!\") }}\n                {%- endif %}\n            {%- endfor %}\n        {%- else %}\n            {{- message[\"content\"] }}\n        {%- endif %}\n        {{- \"[/INST]\" }}\n    {%- elif message[\"role\"] == \"assistant\" %}\n        {{- message[\"content\"] + eos_token}}\n    {%- else %}\n        {{- raise_exception(\"Only user and assistant roles are supported, with the exception of an initial optional system message!\") }}\n    {%- endif %}\n    {%- endfor %}"
 }