OptionalIsPresentInspection: do not warn if map() part can be null

If we cannot determine the non-nullity of map expression, then info
level is used. Fixes IDEA-172609 "Replace Optional.isPresent() checks
with functional-style expressions" is broken.

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/optionalIsPresent/afterTernary.java

@@ -1,4 +1,4 @@
-// "Replace Optional.isPresent() condition with functional style expression" "true"
+// "Replace Optional.isPresent() condition with functional style expression" "GENERIC_ERROR_OR_WARNING"
 
 import java.util.Arrays;
 import java.util.List;

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/optionalIsPresent/afterTernaryFunction.java

@@ -0,0 +1,13 @@
+// "Replace Optional.isPresent() condition with functional style expression" "INFORMATION"
+
+import java.util.Optional;
+import java.util.function.Function;
+import java.util.function.Supplier;
+
+public class Main {
+
+  public void test(Optional<String> opt, Function<String, Object> onPresent, Supplier<Object> onEmpty) {
+    // information level: could be semantic change if onPresent returns null
+    Object o = opt.map(onPresent::apply).orElseGet(onEmpty::get);
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/optionalIsPresent/afterTernaryFunctionNotNull.java

@@ -0,0 +1,14 @@
+// "Replace Optional.isPresent() condition with functional style expression" "GENERIC_ERROR_OR_WARNING"
+
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Optional;
+import java.util.function.Function;
+import java.util.function.Supplier;
+
+public class Main {
+
+  public void test(Optional<String> opt, Function<String, @NotNull Object> onPresent, Supplier<Object> onEmpty) {
+    Object o = opt.map(onPresent::apply).orElseGet(onEmpty::get);
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/optionalIsPresent/beforeTernary.java

@@ -1,4 +1,4 @@
-// "Replace Optional.isPresent() condition with functional style expression" "true"
+// "Replace Optional.isPresent() condition with functional style expression" "GENERIC_ERROR_OR_WARNING"
 
 import java.util.Arrays;
 import java.util.List;

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/optionalIsPresent/beforeTernaryFunction.java

@@ -0,0 +1,13 @@
+// "Replace Optional.isPresent() condition with functional style expression" "INFORMATION"
+
+import java.util.Optional;
+import java.util.function.Function;
+import java.util.function.Supplier;
+
+public class Main {
+
+  public void test(Optional<String> opt, Function<String, Object> onPresent, Supplier<Object> onEmpty) {
+    // information level: could be semantic change if onPresent returns null
+    Object o = opt.is<caret>Present() ? onPresent.apply(opt.get()) : onEmpty.get();
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/optionalIsPresent/beforeTernaryFunctionNotNull.java

@@ -0,0 +1,14 @@
+// "Replace Optional.isPresent() condition with functional style expression" "GENERIC_ERROR_OR_WARNING"
+
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Optional;
+import java.util.function.Function;
+import java.util.function.Supplier;
+
+public class Main {
+
+  public void test(Optional<String> opt, Function<String, @NotNull Object> onPresent, Supplier<Object> onEmpty) {
+    Object o = opt.i<caret>sPresent() ? onPresent.apply(opt.get()) : onEmpty.get();
+  }
+}