Compute return type for property getters more safely

Do not call `isError()` on property's type right after creation of
PropertyGetterDescriptor because the property has no getter yet (it's created
but not yet stored to the property, that happens a bit later), and `isError()`
leads to computation of the delegate type, which for delegated properties
performs some complex resolution (see `VariableTypeResolver#process`) which
relies on the fact that the property already has a getter.

Since the purpose of the original change (883e2e4d) was to support a quick fix
which would add the type to a property in an expression like "val x get() =
...", check the type (or initializer) presence in the PSI instead, this is
safer and is still suitable for the quick fix.

Also fix arguments to "wrong getter type" diagnostic: previously something
useless like "expected Int, actual Int" was reported

 #KT-11809 Fixed

compiler/tests/org/jetbrains/kotlin/checkers/DiagnosticsTestGenerated.java

@@ -4767,6 +4767,12 @@ public class DiagnosticsTestGenerated extends AbstractDiagnosticsTest {
                 doTest(fileName);
             }
 
+            @TestMetadata("nonDefaultAccessors.kt")
+            public void testNonDefaultAccessors() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/delegatedProperty/nonDefaultAccessors.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("propertyDefferedType.kt")
             public void testPropertyDefferedType() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/delegatedProperty/propertyDefferedType.kt");