Don't delete unresolved imports in cleanup inspection (KT-25678)

It looks like they were deleted because of the bug in search for deprecated
imports search.

 #KT-25678 Fixed

idea/src/org/jetbrains/kotlin/idea/quickfix/replaceWith/DeprecatedSymbolUsageFix.kt

@@ -55,7 +55,12 @@ class DeprecatedSymbolUsageFix(
         }
 
         fun isImportToBeRemoved(import: KtImportDirective): Boolean {
-            return !import.isAllUnder && import.targetDescriptors().all {
+            if (import.isAllUnder) return false
+
+            val targetDescriptors = import.targetDescriptors()
+            if (targetDescriptors.isEmpty()) return false
+
+            return targetDescriptors.all {
                 DeprecatedSymbolUsageFixBase.fetchReplaceWithPattern(it, import.project) != null
             }
         }

idea/testData/inspections/cleanup/cleanup.kt

@@ -2,6 +2,7 @@ import pack.oldFun1
 import pack.oldFun2 // should not be removed for non-deprecated overload used
 import pack.oldFun3
 import kotlin.reflect.KProperty
+import some.unresolved.declaration // should not be removed
 
 class A private()
 

idea/testData/inspections/cleanup/cleanup.kt.after

@@ -1,6 +1,7 @@
 import pack.bar
 import pack.oldFun2 // should not be removed for non-deprecated overload used
 import kotlin.reflect.KProperty
+import some.unresolved.declaration // should not be removed
 
 class A private constructor()