fix(cmp, blink): Non-existing peview no longer causes error with completion

Closes #320

Author: OXY2DEV

lua/blink-markview.lua

@@ -44,7 +44,7 @@ function source:get_completions(ctx, callback)
 
 		for key, item in pairs(items) do
 			if vim.list_contains({ "enable", "wrap", "default" }, key) == false then
-				local label = "[!" .. key .. "]" .. " » " .. item.preview;
+				local label = "[!" .. key .. "]" .. " » " .. (item.preview or "");
 				local result = key;
 
 				if string.match(after, "^%]") == nil then
@@ -67,7 +67,7 @@ function source:get_completions(ctx, callback)
 
 					documentation = {
 						kind = "plaintext",
-						value = string.format("▌ %s\n▌ Block quote description.", item.preview);
+						value = string.format("▌ %s\n▌ Block quote description.", item.preview or "");
 					}
 				});
 			end
@@ -77,7 +77,7 @@ function source:get_completions(ctx, callback)
 
 		for key, item in pairs(items) do
 			if vim.list_contains({ "enable", "checked", "unchecked" }, key) == false then
-				local label = "[" .. key .. "]" .. " » " .. item.text .. " ";
+				local label = "[" .. key .. "]" .. " » " .. (item.text or "") .. " ";
 				local result = key;
 
 				if string.match(after, "^%]") == nil then
@@ -100,7 +100,7 @@ function source:get_completions(ctx, callback)
 
 					documentation = {
 						kind = "plaintext",
-						value = string.format("◇ List item,\n  %s Checkbox with\n    some text.", item.text);
+						value = string.format("◇ List item,\n  %s Checkbox with\n    some text.", item.text or "");
 					}
 				});
 			end

lua/cmp-markview.lua

@@ -54,7 +54,7 @@ function source:complete(params, callback)
 				local label = "[!" .. key;
 				local desc = {
 					string.format("▌ %s",
-						item.preview
+						item.preview or ""
 					),
 					"▌ Block quote description."
 				};
@@ -64,7 +64,7 @@ function source:complete(params, callback)
 				end
 
 				local result = label;
-				label = label .. " » " .. item.preview;
+				label = label .. " » " .. (item.preview or "");
 
 				table.insert(comp, {
 					label = label,
@@ -85,7 +85,7 @@ function source:complete(params, callback)
 				local desc = {
 					"◇ List item,",
 					string.format("  %s Checkbox with",
-						item.text
+						item.text or ""
 					),
 					"    some text."
 				};
@@ -95,7 +95,7 @@ function source:complete(params, callback)
 				end
 
 				local result = label;
-				label = label .. " » " .. item.text;
+				label = label .. " » " .. (item.text or "");
 
 				table.insert(comp, {
 					label = label,