Empty lists in YAML test lead to compilation errors.

[rcasallas-silabs]

Problem

Empty lists in the YAML tests generates code that fails to compile, for instance:

    - label: "Get Group Membership"
      command: "GetGroupMembership"
      arguments:
          values:
              - name: "groupList"
                value: []

Results in:

g++ -MMD -MF obj/chip-tool.main.cpp.o.d -Wconversion -target x86_64-apple-macos10.15 -O0 -g2 -fno-common -ffunction-sections -fdata-sections -fno-exceptions -fno-unwind-tables -fno-asynchronous-unwind-tables -fPIC -Wall -Werror -Wextra -Wshadow -Wunreachable-code -Wvla -Wno-deprecated-declarations -Wno-unknown-warning-option -Wno-maybe-uninitialized -Wno-missing-field-initializers -Wno-unused-parameter -Wno-psabi -Wno-cast-function-type -fdiagnostics-color -fno-strict-aliasing -I/usr/local/Cellar/[email protected]/1.1.1l/include -fobjc-arc -std=gnu++14 -fno-rtti -Wnon-virtual-dtor -DCONFIG_USE_SEPARATE_EVENTLOOP=true -DCHIP_HAVE_CONFIG_H=1 -I../../../../examples/chip-tool -I../../../../examples/chip-tool/third_party/connectedhomeip/zzz_generated/chip-tool -I../../../../examples/chip-tool/third_party/connectedhomeip/zzz_generated/controller-clusters -I../../../../examples/chip-tool/third_party/connectedhomeip/src/include -I../../../../examples/chip-tool/third_party/connectedhomeip/src -Igen/include -I../../../../examples/chip-tool/third_party/connectedhomeip/zzz_generated/app-common -I../../../../examples/chip-tool/third_party/connectedhomeip/config/standalone -I../../../../examples/chip-tool/third_party/connectedhomeip/third_party/nlassert/repo/include -I../../../../examples/chip-tool/third_party/connectedhomeip/third_party/nlio/repo/include -I../../../../examples/chip-tool/third_party/connectedhomeip/zzz_generated -I../../../../examples/chip-tool/third_party/connectedhomeip/third_party/inipp/repo/inipp -c ../../../../examples/chip-tool/main.cpp -o obj/chip-tool.main.cpp.o
In file included from ../../../../examples/chip-tool/main.cpp:27:
../../../../examples/chip-tool/third_party/connectedhomeip/zzz_generated/chip-tool/zap-generated/test/Commands.h:27882:27: error: no viable overloaded '='
        request.groupList = groupListList;
        ~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~
../../../../examples/chip-tool/third_party/connectedhomeip/src/app/data-model/List.h:39:8: note: candidate function (the implicit copy assignment operator) not viable: no known conversion from 'uint16_t [0]' to 'const chip::app::DataModel::List<const unsigned short>' for 1st argument
struct List : public Span<T>
       ^
../../../../examples/chip-tool/third_party/connectedhomeip/src/app/data-model/List.h:39:8: note: candidate function (the implicit move assignment operator) not viable: no known conversion from 'uint16_t [0]' to 'chip::app::DataModel::List<const unsigned short>' for 1st argument
../../../../examples/chip-tool/third_party/connectedhomeip/src/app/data-model/List.h:53:22: note: candidate template ignored: substitution failure [with N = 0]: zero-length arrays are not permitted in C++
    constexpr List & operator=(T (&databuf)[N])
                     ^                      ~
1 error generated.

Proposed Solution

None yet.