Fixed assertion error for incomplete code.

compiler/frontend/src/org/jetbrains/jet/lang/cfg/PseudocodeVariableDataCollector.kt

@@ -79,12 +79,14 @@ public class PseudocodeVariableDataCollector(
             if (instruction is VariableDeclarationInstruction) {
                 val variableDeclarationElement = instruction.getVariableDeclarationElement()
                 val descriptor = bindingContext.get(BindingContext.DECLARATION_TO_DESCRIPTOR, variableDeclarationElement)
+                if (descriptor != null) {
                     assert(descriptor is VariableDescriptor,
                            "Variable descriptor should correspond to the instruction for ${instruction.getElement().getText()}.\n" +
                            "Descriptor : $descriptor")
                     lexicalScopeVariableInfo.registerVariableDeclaredInScope(
                             descriptor as VariableDescriptor, instruction.getLexicalScope())
                 }
+            }
         })
         return lexicalScopeVariableInfo
     }

compiler/testData/diagnostics/tests/incompleteCode/variableDeclarationInSelector.kt

@@ -0,0 +1,4 @@
+fun foo(s: String) {
+    s.
+    <!ILLEGAL_SELECTOR!>val b = 42<!>
+}

compiler/tests/org/jetbrains/jet/checkers/JetDiagnosticsTestGenerated.java

@@ -3416,6 +3416,11 @@ public class JetDiagnosticsTestGenerated extends AbstractJetDiagnosticsTest {
                 doTest("compiler/testData/diagnostics/tests/incompleteCode/typeParameterOnLhsOfDot.kt");
             }
             
+            @TestMetadata("variableDeclarationInSelector.kt")
+            public void testVariableDeclarationInSelector() throws Exception {
+                doTest("compiler/testData/diagnostics/tests/incompleteCode/variableDeclarationInSelector.kt");
+            }
+            
             @TestMetadata("compiler/testData/diagnostics/tests/incompleteCode/diagnosticWithSyntaxError")
             public static class DiagnosticWithSyntaxError extends AbstractJetDiagnosticsTest {
                 public void testAllFilesPresentInDiagnosticWithSyntaxError() throws Exception {