Залечено NRE в конструкторах про которые известно. closes #1197

Author: EvilBeaver

src/ScriptEngine.HostedScript/Library/FixedStructureImpl.cs

@@ -153,7 +153,10 @@ private static FixedStructureImpl Constructor(StructureImpl structObject)
         [ScriptConstructor(Name = "По ключам и значениям")]
         public static FixedStructureImpl Constructor(IValue param1, IValue[] args)
         {
-            var rawArgument = param1.GetRawValue();
+            var rawArgument = param1?.GetRawValue();
+            if (rawArgument == null)
+                return new FixedStructureImpl("");
+            
             if (rawArgument.DataType == DataType.String)
             {
                 return new FixedStructureImpl(param1.AsString(), args);

src/ScriptEngine.HostedScript/Library/StructureImpl.cs

@@ -245,7 +245,10 @@ private static StructureImpl Constructor(FixedStructureImpl fixedStruct)
         [ScriptConstructor(Name = "По ключам и значениям")]
         public static StructureImpl Constructor(IValue param1, IValue[] args)
         {
-            var rawArgument = param1.GetRawValue();
+            var rawArgument = param1?.GetRawValue();
+            if (rawArgument == null)
+                return new StructureImpl();
+            
             if (rawArgument.DataType == DataType.String)
             {
                 return new StructureImpl(rawArgument.AsString(), args);

src/ScriptEngine.HostedScript/Library/Zip/ZipReader.cs

@@ -54,7 +54,7 @@ public void Open(IValue filenameOrStream, string password = null, FileNamesEncod
             {
                 _zip = ZipFile.Read(filenameOrStream.AsString(), new ReadOptions { Encoding = ChooseEncoding(encoding) });
             } 
-            else if (filenameOrStream.AsObject() is IStreamWrapper stream)
+            else if (filenameOrStream.DataType == DataType.Object && filenameOrStream.AsObject() is IStreamWrapper stream)
             {
                 _zip = ZipFile.Read(stream.GetUnderlyingStream(), new ReadOptions { Encoding = ChooseEncoding(encoding) });
             } 
@@ -157,7 +157,7 @@ public static ZipReader Construct()
         [ScriptConstructor(Name = "На основании имени файла или потока")]
         public static ZipReader Constructor(IValue dataSource, IValue password = null)
         {
-            var dataSourceRawValue = dataSource.GetRawValue();
+            var dataSourceRawValue = dataSource?.GetRawValue() ?? ValueFactory.CreateInvalidValueMarker();
 
             return new ZipReader(dataSourceRawValue, password?.AsString());
         }