Do not crash shellcheck parser

Author: skovhus

server/src/util/__tests__/sourcing.test.ts

@@ -173,6 +173,8 @@ describe('getSourcedUris', () => {
 
       # shellcheck source-path=SCRIPTDIR # note that this is already the behaviour of bash language server
       source ./testing/fixtures/issue101.sh
+
+      source # not finished
       `
 
     const sourceCommands = getSourceCommands({

server/src/util/sourcing.ts

@@ -59,6 +59,11 @@ function getSourcedPathInfoFromNode({
 }): null | { sourcedPath?: string; parseError?: string } {
   if (node.type === 'command') {
     const [commandNameNode, argumentNode] = node.namedChildren
+
+    if (!commandNameNode || !argumentNode) {
+      return null
+    }
+
     if (
       commandNameNode.type === 'command_name' &&
       SOURCING_COMMANDS.includes(commandNameNode.text)