fix issue #240 (#241)

.gitignore

@@ -1,6 +1,9 @@
 CheckStyle-IDEA.zip
 .DS_Store
 /*.iws
+*.ipr
+*.iml
+.idea/
 /target/
 /build/*
 /test-configs/

src/main/java/org/infernus/idea/checkstyle/CheckStyleInspection.java

@@ -22,6 +22,7 @@
 import org.jetbrains.annotations.Nullable;
 
 import javax.swing.*;
+import java.io.FileNotFoundException;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
@@ -98,6 +99,9 @@ public List<Problem> inspectFile(@NotNull final PsiFile psiFile,
         } catch (CheckStylePluginException e) {
             blacklist(configurationLocation);
             LOG.error("CheckStyle threw an exception when scanning: " + psiFile.getName(), e);
+            if (e.getCause() instanceof FileNotFoundException){
+                plugin.getConfiguration().setActiveConfiguration(null);
+            }
             return NO_PROBLEMS_FOUND;
 
         } catch (Throwable e) {

src/main/java/org/infernus/idea/checkstyle/checker/CheckerFactory.java

@@ -50,7 +50,7 @@ public Optional<CheckStyleChecker> checker(@Nullable final Module module,
     @Nullable
     private CheckStyleChecker checker(@Nullable final Module module,
                                       @Nullable final ConfigurationLocation location,
-                                      @Nullable final ClassLoader classLoader) {
+                                      @Nullable final ClassLoader classLoader) throws CheckStylePluginException {
         LOG.debug("Getting CheckStyle checker with location " + location);
 
         if (location == null) {