fix unexpected error (#38)

If the text is empty don't do lint to avoid causing unexpected error.
fix: #36

Author: joe-re

packages/server/createDiagnostics.ts

@@ -9,6 +9,9 @@ import cache, { LintCache } from './cache'
 const logger = log4js.getLogger()
 
 function doLint(uri: string, sql: string): Diagnostic[] {
+  if (!sql) {
+    return []
+  }
   const result: LintResult[] = JSON.parse(lint({ configPath: process.cwd(), formatType: 'json', text: sql }))
   const lintDiagnostics = result.map(v => v.diagnostics).flat()
   const lintCache: LintCache[] = []

packages/sqlint/src/cli/lint.ts

@@ -59,7 +59,7 @@ export function lint (
   const { path, formatType, configPath, outputFile, text } = params
   const files = path ? getFileList(path) : []
   if (files.length === 0 && !text) {
-    throw new Error(`No files matching '${path}' were found.`)
+    throw new Error(`No files matching. path: ${path}`)
   }
   const config = loadConfig(configPath || process.cwd())