Fix NullReferenceException when analysing partial script with InnerBrace option of UseConsistentWhitespace (#1834)

* Fix NullReferenceException when analysing partial script with InnerBrace option of UseConsistentWhitespace

* tweak test name

* formatting

Author: bergmeister

Rules/UseConsistentWhitespace.cs

@@ -260,7 +260,7 @@ private IEnumerable<DiagnosticRecord> FindInnerBraceViolations(TokenOperations t
             foreach (var lCurly in tokenOperations.GetTokenNodes(TokenKind.LCurly))
             {
                 if (lCurly.Next == null
-                    || !IsPreviousTokenOnSameLine(lCurly)
+                    || !(lCurly.Previous == null || IsPreviousTokenOnSameLine(lCurly))
                     || lCurly.Next.Value.Kind == TokenKind.NewLine
                     || lCurly.Next.Value.Kind == TokenKind.LineContinuation
                     || lCurly.Next.Value.Kind == TokenKind.RCurly
@@ -616,7 +616,7 @@ private List<CorrectionExtent> GetCorrections(
         }
 
 
-        private bool IsPreviousTokenOnSameLine(LinkedListNode<Token> lparen)
+        private static bool IsPreviousTokenOnSameLine(LinkedListNode<Token> lparen)
         {
             return lparen.Previous.Value.Extent.EndLineNumber == lparen.Value.Extent.StartLineNumber;
         }

Tests/Rules/UseConsistentWhitespace.tests.ps1

@@ -508,6 +508,10 @@ if ($true) { Get-Item `
 '@
             Invoke-ScriptAnalyzer -ScriptDefinition $def -Settings $settings | Should -Be $null
         }
+
+        It 'Should not throw when analysing a line starting with a scriptblock' {
+            { Invoke-ScriptAnalyzer -ScriptDefinition '{ }' -Settings $settings -ErrorAction Stop } | Should -Not -Throw
+        }
     }