Add warn that user can not use --strictPropertyInitialization without --strictNullChecks

Author: a-tarasyuk

src/compiler/program.ts

@@ -2062,6 +2062,10 @@ namespace ts {
         }
 
         function verifyCompilerOptions() {
+            if (options.strictPropertyInitialization && !options.strictNullChecks) {
+                createDiagnosticForOptionName(Diagnostics.Option_0_cannot_be_specified_without_specifying_option_1, "strictPropertyInitialization", "strictNullChecks");
+            }
+
             if (options.isolatedModules) {
                 if (options.declaration) {
                     createDiagnosticForOptionName(Diagnostics.Option_0_cannot_be_specified_with_option_1, "declaration", "isolatedModules");