fix(snippets): add missing "then" to existence checks

Author: alexanderwoehler

server/src/snippets.ts

@@ -153,14 +153,14 @@ export const SNIPPETS: BashCompletionItem[] = [
   {
     label: 'if-defined',
     documentation: 'if with variable existence check',
-    insertText: ['if [[ -n "${${1:variable}+x}" ]]', '\t${2:command ...}', 'fi'].join(
+    insertText: ['if [[ -n "${${1:variable}+x}" ]]; then', '\t${2:command ...}', 'fi'].join(
       '\n',
     ),
   },
   {
     label: 'if-not-defined',
     documentation: 'if with variable existence check',
-    insertText: ['if [[ -z "${${1:variable}+x}" ]]', '\t${2:command ...}', 'fi'].join(
+    insertText: ['if [[ -z "${${1:variable}+x}" ]]'; then, '\t${2:command ...}', 'fi'].join(
       '\n',
     ),
   },